BharatNotes Note: This chapter was removed from the NCERT curriculum in the 2022 rationalization. Retained here as the Periodic Table underpins materials science, nuclear energy, critical minerals, and chemistry-based GS3 science & technology questions.
Why this chapter matters for UPSC: The Periodic Table is not just a chemistry classroom tool — it is the map of strategic resources. Understanding why rare earth elements (lanthanides — the f-block) are grouped together explains China's dominance in their processing. Understanding why silicon (Group 14, semiconductor) and gallium arsenide replace each other in electronics underpins India's Semiconductor Mission. The concepts of metallic/non-metallic character, periodic trends, and group behaviour inform questions about nuclear energy (uranium, thorium — actinides), hydrogen economy (Group 1 position of H), and agricultural chemistry (phosphorus, nitrogen, potassium — the NPK of fertilisers).
PART 1 — Quick Reference Tables
History of Periodic Classification
| Scientist | Year | Basis | System | Limitation |
|---|---|---|---|---|
| Döbereiner | 1817 | Atomic mass | Triads: middle element's property = average of outer two (Li-Na-K; Ca-Sr-Ba; Cl-Br-I) | Only worked for a few groups; could not accommodate all known elements |
| Newlands | 1865 | Atomic mass | Law of Octaves: every 8th element has similar properties (like musical scale) | Worked only up to calcium (20th element); no gaps left for undiscovered elements; some triads forced incorrectly |
| Mendeleev | 1869 | Atomic mass | Periodic Law: properties repeat when arranged by increasing atomic mass; left gaps for undiscovered elements; predicted properties of eka-aluminium (gallium, discovered 1875) and eka-silicon (germanium, discovered 1886) | Could not explain isotopes; position of hydrogen ambiguous; some anomalies (Ar before K; Co before Ni) |
| Moseley / Modern | 1913 | Atomic number (protons) | Modern Periodic Law: properties repeat when arranged by increasing atomic number; resolves Mendeleev's anomalies | Basis of Modern Periodic Table still in use |
Modern Periodic Table Structure
| Feature | Details | UPSC Relevance |
|---|---|---|
| Periods (rows) | 7 periods; period number = number of electron shells; Period 1 has 2 elements (H, He); Period 7 is the actinide period (radioactive heavy elements) | Period 7 contains U, Th, Pu (nuclear fuel/weapons elements) |
| Groups (columns) | 18 groups; elements in same group have same number of valence electrons → similar chemistry | Group 1 (alkali metals) explosive reactivity; Group 17 (halogens) — F, Cl, Br, I; Group 18 (noble gases) inert |
| s-block | Groups 1–2 | Alkali and alkaline earth metals; Na (salt, chlor-alkali), Ca (cement, bones), Mg (lightweight alloys, chlorophyll) |
| p-block | Groups 13–18 | Contains C, N, O, Si, Al, halogens, noble gases — huge diversity; semiconductors (Si, Ge) in Group 14 |
| d-block (transition metals) | Groups 3–12 | Fe, Cu, Zn, Ni, Co, Ti, V, Cr, Mn, Pt, Au — most industrially important metals; catalysts; critical minerals |
| f-block | Lanthanides (period 6) + Actinides (period 7) | REEs (La–Lu + Sc, Y); Th, U, Pu for nuclear energy; China's REE dominance |
Periodic Trends
| Property | Trend Across Period (→) | Trend Down Group (↓) | Reason |
|---|---|---|---|
| Atomic radius | Decreases | Increases | Across: more protons, same shells → nucleus pulls electrons closer. Down: more shells added |
| Ionisation energy | Increases (harder to remove electrons) | Decreases | Across: smaller atoms hold electrons more tightly. Down: outer electrons farther from nucleus, more shielded |
| Metallic character | Decreases | Increases | Metals lose electrons easily; across → harder to lose electrons; down → easier |
| Non-metallic character | Increases | Decreases | Mirrors metallic character |
| Electronegativity | Increases | Decreases | Fluorine (F) is the most electronegative element in existence |
| Valency | Increases 1→4 (first half), then decreases 4→0 (second half) | Remains same | Valence electrons: Group 1 = 1, Group 14 = 4, Group 17 = 7 (but valency = 1), Group 18 = 0 |
PART 2 — Detailed Notes
1. Historical Development of the Periodic Table
Döbereiner's Triads (1817): Johann Wolfgang Döbereiner noticed that when three chemically similar elements were grouped, the middle element's atomic mass was approximately the arithmetic mean of the other two. For example:
- Lithium (7), Sodium (23), Potassium (39) — Na ≈ (7+39)/2 = 23 ✓
- Calcium (40), Strontium (88), Barium (137) — Sr ≈ (40+137)/2 ≈ 88.5 ✓
- Chlorine (35.5), Bromine (80), Iodine (127) — Br ≈ (35.5+127)/2 ≈ 81 ✓
This was the first recognition that elements could be grouped by similarity. However, only a few triads worked — most elements did not fit neatly.
Newlands' Law of Octaves (1865): John Newlands arranged the 62 known elements by atomic mass and noticed that every eighth element had similar properties to the first — like the octave in Western music (do, re, mi, fa, sol, la, ti, do). The system worked well for the first 20 elements but broke down after calcium — heavier elements did not fit neatly. He was also criticised for not leaving gaps for undiscovered elements.
Mendeleev's Periodic Table (1869): Dmitri Mendeleev's genius was in recognising that some gaps in his table represented undiscovered elements. He predicted the properties of three: eka-boron (later scandium, 1879), eka-aluminium (gallium, discovered 1875 — its density matched Mendeleev's prediction), and eka-silicon (germanium, 1886 — its properties matched predictions remarkably well). This predictive power made the periodic table one of science's greatest organisational tools.
Mendeleev's anomalies: Despite its success, Mendeleev's table had problems: (1) Argon (Ar, atomic mass 39.9) had to be placed before potassium (K, atomic mass 39.1) to fit chemical properties — violating the atomic mass ordering; (2) Cobalt (Co, 58.9) placed before nickel (Ni, 58.7) for same reason; (3) isotopes of the same element have different atomic masses — where do they go? All these anomalies were resolved when Moseley (1913) showed that atomic number (protons), not mass, is the true organising principle.
2. Structure of the Modern Periodic Table
The modern table has 118 confirmed elements arranged in 7 periods and 18 groups. The table encodes the electronic configuration of each element — which determines its chemical behaviour.
Periods: Each new period begins when electrons start filling a new shell. Period 1 (H, He) — shell 1; Period 2 (Li to Ne) — shell 2; Period 3 (Na to Ar) — shell 3; and so on. Period 7 (from Fr to Og) is the most recently completed period — all elements from Z=87 to Z=118 are either radioactive or synthetic.
Groups: Elements in the same group have the same number of valence electrons — this is why they share chemical properties:
- Group 1 (Alkali metals): Li, Na, K, Rb, Cs, Fr — all have 1 valence electron; all react violently with water to produce Hâ‚‚ and a metal hydroxide; softness increases and reactivity increases down the group (Cs and Fr react explosively with water)
- Group 17 (Halogens): F, Cl, Br, I, At — all have 7 valence electrons; need 1 more electron for complete octet; highly reactive non-metals; reactivity decreases down the group (F is most reactive, I least among the common halogens)
- Group 18 (Noble gases): He, Ne, Ar, Kr, Xe, Rn — complete outer shell; chemically inert; used in lighting (neon signs, argon in bulbs), welding shields (Ar), and cryogenics (He)
3. Blocks of the Periodic Table
s-block (Groups 1–2): Includes some of the most reactive metals and the alkaline earth metals. Sodium (Group 1, Period 3) is the basis of salt (NaCl), the chlor-alkali industry, and sodium-ion batteries (promising alternative to Li-ion). Calcium (Group 2, Period 4) forms the skeleton (Ca in bone and teeth as Ca₃(POâ‚„)â‚‚ and CaCO₃), cement (CaO), and is used in water treatment.
p-block (Groups 13–18): Enormous chemical diversity:
- Carbon (Group 14) — organic chemistry, life
- Nitrogen (Group 15) — 78% of atmosphere; Haber process (fertilisers); explosives
- Oxygen (Group 16) — respiration; oxidation; water (with Hâ‚‚)
- Silicon (Group 14) — most abundant element in Earth's crust after oxygen; basis of silicate rocks, sand (SiOâ‚‚), glass, cement, and the semiconductor industry
d-block (Groups 3–12 — Transition Metals): These are the "workhorse" metals of industry — iron (steel), copper (wiring), zinc (galvanising), nickel (stainless steel, batteries), cobalt (batteries, superalloys), titanium (aerospace, medical implants), platinum and palladium (catalytic converters, fuel cells), chromium (stainless steel, hard chrome plating), vanadium (steel alloys, vanadium flow batteries).
f-block (Lanthanides and Actinides):
UPSC GS3 — Rare Earth Elements (REEs) and Geopolitics: The 17 rare earth elements (REEs) — 15 lanthanides (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) plus scandium (Sc) and yttrium (Y) — sit in the f-block and d-block respectively. Despite the name, most REEs are not exceptionally rare in the Earth's crust — but they are very difficult to separate from each other (they have nearly identical chemical properties), and economic deposits are concentrated geographically.
China's dominance: ~60% of global REE production and ~85% of processing/refining capacity. In 2023, China imposed export controls on gallium and germanium (critical for semiconductors and REE processing) — a direct geopolitical signal.
Why REEs matter:
- Neodymium (Nd) + Dysprosium (Dy) → NdFeB permanent magnets (motors in EVs, generators in wind turbines — one offshore wind turbine uses ~2 tonnes of REE magnets; a Tesla motor uses ~1 kg Nd)
- Lanthanum (La) → NiMH batteries, petroleum cracking catalysts
- Cerium (Ce) → catalytic converters, polishing compounds, UV-resistant glass
- Europium (Eu) + Terbium (Tb) → red and green phosphors in LED lights and screens
India's REE potential: India has the world's 5th largest REE reserves, primarily as monazite (a phosphate mineral rich in Ce, La, Nd, Th) in beach/coastal placer sands — Kerala (Chavara — IREL operates here), Tamil Nadu (Manavalakurichi), Odisha, and Jharkhand. Monazite also contains thorium (~8–10%), making it strategic for India's 3-stage nuclear programme. Indian Rare Earths Ltd (IREL-India) — a CPSE under DAE — processes monazite and is India's primary REE producer.
India's National Critical Mineral Mission (NCMM, January 2025) — Cabinet-approved January 2025; outlay ₹34,300 crore over 7 years (GoI share ₹16,300 crore + PSU/other ₹18,000 crore); targets 1,200 domestic exploration projects by 2030-31 and domestic production of at least 15 critical minerals — and KABIL (Khanij Bidesh India Ltd — JV of NALCO, HCL, MECL for overseas mineral asset acquisition) are India's strategic responses to REE supply insecurity.
Actinides (Z=89–103): All are radioactive. The most important for India:
- Thorium (Th, Z=90): India has the world's largest thorium reserves (~25% of global — monazite sands). Central to India's Three-Stage Nuclear Programme (Stage 3: fast breeder reactors using U-233 bred from Th-232). The Bhabha Atomic Research Centre (BARC) and IGCAR (Kalpakkam) lead this research.
- Uranium (U, Z=92): India's domestic uranium reserves are modest (mainly Jharkhand — Jaduguda mines; Andhra Pradesh — Tummalapalle mine). India is an NSG waiver recipient (2008 India-US nuclear deal) and imports uranium from Kazakhstan, Canada, Australia, Russia, France.
- Plutonium (Pu, Z=94): Produced in reactors from U-238; used in Stage 2 of India's nuclear programme (Fast Breeder Reactors). [Additional] India's PFBR (Prototype Fast Breeder Reactor) at Kalpakkam, Tamil Nadu achieved first criticality on April 6, 2026 (DAE/BHAVINI). This 500 MWe sodium-cooled fast breeder reactor (designed by IGCAR, built by BHAVINI) uses uranium-plutonium mixed oxide (MOX) fuel; its U-238 blanket breeds more Pu-239. Commercial electricity generation projected September 2026. This completes Stage 2 entry — a landmark in India's 3-stage nuclear programme, delayed by 16 years from the original 2010 target.
4. Periodic Trends and Their Implications
Metallic character decreases across a period — this is why the boundary between metals and non-metals runs diagonally (silicon, germanium, arsenic, antimony, tellurium — the metalloids or semiconductors). Elements near this boundary have intermediate properties — neither fully metallic nor fully non-metallic — which makes them ideal semiconductors.
UPSC GS3 — India's Semiconductor Mission: Semiconductors (primarily silicon, Group 14) are the foundation of the digital economy — every microchip, solar cell, and power electronic device uses semiconductor materials. India imports virtually all its chips (~₹5 lakh crore worth annually).
India Semiconductor Mission (ISM) launched 2021 with ₹76,000 crore incentive package:
- Micron Technology chip assembly and test plant in Sanand, Gujarat (India's first modern chip facility — announced 2023; ₹22,500 crore, Micron investment ~$825 million + GoI support)
- Tata Electronics-PSMC fab in Dholera Special Investment Region, Gujarat (announced 2024; 28nm chips; ₹91,000 crore total investment — India's first wafer fabrication plant)
- CG Power-Renesas-Stars Microelectronics assembly and test unit in Sanand, Gujarat
The periodic table context: Silicon (Si, Group 14, Period 3) dominates mainstream chips. Gallium Arsenide (GaAs — Ga is Group 13, As is Group 15) is used for high-frequency/high-power chips (5G, satellite communications, defence radar). Gallium Nitride (GaN — power electronics, EV chargers). Silicon Carbide (SiC — EV inverters, fast charging). India's mission aims to move up the value chain from chip assembly (back-end) to chip fabrication (front-end) — a far more complex and capital-intensive step.
[Additional] 5a. Gallium and Germanium — China's Critical Mineral Weaponization and the Semiconductor Supply Chain
The chapter covers Mendeleev's prediction of gallium (eka-aluminium, Group 13) and the semiconductor properties of elements near the metalloid boundary (Group 14). What is missing is the current strategic reality: China controls ~98–99% of global primary gallium production and ~60% of germanium — and used export licensing controls in 2023 to demonstrate that processing dominance is geopolitical leverage.
Gallium and Germanium — Periodic Table Position Explains Their Strategic Value:
Both elements sit in Period 4, near the metal-nonmetal diagonal boundary:
| Element | Group | Period | Type | Key Semiconductor Compounds |
|---|---|---|---|---|
| Gallium (Ga, Z=31) | 13 | 4 | Post-transition metal | GaN (gallium nitride): 5G RF chips, radar, EV chargers, LEDs; GaAs (gallium arsenide): high-speed electronics, solar cells |
| Germanium (Ge, Z=32) | 14 | 4 | Metalloid | Fiber optic cables (GeO₂); SiGe transistors; infrared optics; night-vision devices |
Why Group 13/14 boundary elements are semiconductors: Elements in this region of the periodic table have intermediate ionisation energies and electronegativities — neither fully metallic (low IE) nor fully non-metallic (high IE). This makes them intrinsic semiconductors or enables semiconductor compound formation. Silicon (Group 14, Period 3) is the canonical case; gallium and germanium, being Period 4 neighbours, have the same structural logic but different bandgap energies — making them essential for high-frequency, high-power applications where silicon's bandgap is suboptimal.
Mendeleev's prediction (1869): Gallium was his predicted eka-aluminium — he forecast its atomic mass (~68), density (~5.9 g/cm³), and that it would be a low-melting metal. When Lecoq de Boisbaudran discovered gallium in 1875 with density 5.91 g/cm³ and melting point 29.76°C, it was the most spectacular validation of the periodic table's predictive power.
[Additional] China's Critical Mineral Export Controls — GS3 (Science & Technology / International Relations / Strategic Resources):
China's production dominance (USGS Mineral Commodity Summaries 2025):
| Mineral | China's share of world primary production | India's domestic production |
|---|---|---|
| Gallium | ~98–99% | None (no commercial recovery) |
| Germanium | ~60% | None |
| Antimony | ~63% | Negligible |
Both gallium and germanium are byproducts — gallium is recovered from the Bayer process of aluminium smelting and from zinc ore processing; germanium from zinc smelting and coal fly ash. No country outside China has scaled this byproduct recovery to meaningful quantities.
The export control timeline:
- August 1, 2023: China's Ministry of Commerce licensing controls on gallium and germanium took effect — 8 categories of compounds and metals required government export licenses, with processing times up to 60 working days
- Immediate impact: China's germanium exports (August 2023–August 2024) fell 55% versus the same period in 2023; gallium spot prices rose sharply
- September 15, 2024: China imposed separate export controls on antimony (critical for military ammunition, flame retardants, and lead-acid batteries); antimony exports from China fell 97% and prices surged 200%
- December 3, 2024: China escalated to a total export ban on gallium, germanium, antimony, and superhard materials specifically to the United States — a direct retaliation for US adding 140 Chinese entities to its export control Entity List
- November 2025: Ban temporarily suspended as part of the US-China trade truce following the Xi-Trump meeting; exports to the US resumed under licensing until November 27, 2026; the ban on military end-users remains in force
India's status:
- Both gallium and germanium are explicitly on India's 30 Critical Minerals List (Ministry of Mines, June 2023) — one of the first formal recognitions of their strategic importance
- India has no significant domestic production of either mineral; gallium recovery from India's aluminium industry (NALCO, BALCO, Hindalco) is technically possible but no commercial-scale program exists as of 2026
- The India-US iCET (Initiative on Critical and Emerging Technologies) framework addresses semiconductor supply chain resilience, including joint stockpiling and supply chain mapping for critical minerals
- KABIL (Khanij Bidesh India Ltd.) — India's overseas critical mineral acquisition JV (NALCO + HCL + MECL) — is mandated to acquire gallium and germanium assets abroad but no confirmed deals exist as of May 2026
UPSC synthesis: Gallium and germanium connect Mendeleev's periodic table predictions (Prelims: eka-aluminium = gallium) to India's Semiconductor Mission supply chain vulnerability (Mains GS3). The August 2023 controls are the most concrete modern example of critical mineral weaponisation — China demonstrated that processing dominance translates to geopolitical coercive capacity, even for minerals not mined exclusively in China. India's 30 Critical Minerals list + KABIL mandate + iCET framework form the policy response chain.
[Additional] 5b. Vanadium Redox Flow Batteries — d-Block Chemistry Enabling Grid-Scale Energy Storage
The chapter covers d-block transition metals (Groups 3–12) and the concept that transition metals have variable valency due to their partially filled d-orbitals. What is missing is the most direct application of this principle to India's energy future: vanadium (Group 5) has four stable oxidation states (+2, +3, +4, +5) — and this unique d-block property is exactly what makes Vanadium Redox Flow Batteries (VRFBs) the most promising technology for grid-scale long-duration energy storage. India commissioned its first MWh-scale VRFB in November 2025.
How d-Block Chemistry Enables VRFBs — The Direct Periodic Table Connection:
Vanadium (V, Z=23, Group 5, Period 4, d-block): electron configuration [Ar] 3d³ 4s². The 3 electrons in the d-orbital can be removed sequentially at accessible energies, giving vanadium four stable aqueous oxidation states:
| Ion | Oxidation state | Colour in solution |
|---|---|---|
| V²⁺ | +2 | Violet |
| V³⁺ | +3 | Dark green |
| VO²⁺ (vanadyl ion) | +4 | Blue |
| VO₂⁺ | +5 | Yellow-orange |
The VRFB working principle:
A VRFB stores energy as chemical energy in two vanadium electrolyte tanks (not in solid electrode material like a lithium-ion battery):
- Positive electrode half-cell: VO₂⁺ (V⁵) + H⁺ + e⁻ ⇌ VO²⁺ (V⁴) + H₂O — charging converts V⁴ to V⁵; discharging reverses
- Negative electrode half-cell: V³⁺ + e⁻ ⇌ V²⁺ — charging reduces V³ to V²; discharging reverses
- Cell voltage: ~1.26 V per cell; arrays of cells build to utility voltage
Why using only vanadium on both sides is revolutionary: In conventional batteries, different chemicals on positive and negative electrodes cross-contaminate through the membrane over time — causing permanent capacity loss. Since VRFBs use vanadium on both sides, cross-contamination only causes a temporary valency imbalance, corrected by rebalancing — giving VRFBs theoretical unlimited cycle life (20,000+ cycles) with no permanent capacity fade.
[Additional] India's Grid-Scale VRFB Development — GS3 (Energy / Science & Technology):
India's grid storage need (National Electricity Plan 2023, CEA):
- India's NEP 2023 projects 236 GWh of BESS capacity by 2031–32 (to integrate 500 GW renewable capacity by 2030)
- CEA's Optimal Generation Mix 2030 report: 41.65 GW of BESS required by FY2029–30
- The government approved a Viability Gap Funding (VGF) scheme for 30 GWh of BESS (June 2025): ₹5,400 crore from the Power System Development Fund at ₹18 lakh per MWh; technology-agnostic — VRFBs eligible alongside lithium-ion
India's landmark VRFB milestones (2025):
- November 11, 2025 (PIB confirmed): Union Power Minister Manohar Lal inaugurated India's first MWh-scale Vanadium Redox Flow Battery — a 3 MWh system at NTPC NETRA (R&D Centre, Greater Noida, Uttar Pradesh) [PIB PRID: 2188916] — a demonstration installation validating VRFB technology in Indian grid conditions
- November 18, 2025: NTPC Renewable Energy Ltd issued an EPC tender for a 16.7 MW / 100 MWh VRFB system at Khavda Solar Park, Gujarat (India's largest solar park, 4,750 MW total capacity; Rann of Kutch region) — if completed, this would be India's first utility-scale VRFB and among the largest in South Asia
Vanadium supply chain — the China risk and India's unique hedge:
| Country | Vanadium production 2024 (USGS MCS 2025) | Share |
|---|---|---|
| China | ~70,000 MT | ~70% |
| Russia | ~16,000 MT | ~16% |
| South Africa | ~9,400 MT | ~9% |
| Brazil | ~5,700 MT | ~6% |
India has no significant vanadium mining production; GSI has identified deposits in Arunachal Pradesh but no published commercial reserve estimate.
India's circular economy approach — vanadium from refinery waste: India is one of the world's largest oil refiners. Crude oil processing generates petroleum coke (petcoke) and spent catalysts containing significant vanadium concentrations (vanadium is naturally present in crude oil). This waste stream is currently discarded or used as low-grade fuel.
- July 2025: VFlowTech (VRFB manufacturer, India) and IIT Delhi's FITT signed a collaboration to develop India's first circular vanadium supply chain — extracting battery-grade vanadium pentoxide (V₂O₅) from refinery petcoke waste. If scaled, this could partially offset import dependency using domestically generated industrial waste.
UPSC synthesis: VRFBs directly apply this chapter's d-block variable oxidation state concept (the defining property of transition metals) to India's most urgent energy infrastructure challenge: grid-scale storage for renewable integration. The November 2025 NTPC NETRA inauguration and Khavda tender mark India's transition from research to deployment. The vanadium supply chain (China ~70% dominance + Indian refinery petcoke alternative) mirrors the REE/gallium pattern: strategic mineral vulnerability + indigenous circular economy solution. Energy Storage Obligation (ESO), NEP 2023 BESS targets, and VGF scheme are the policy framework connecting this chemistry to GS3 energy policy.
[Additional] 5b. Critical Minerals — KABIL, the 30-Mineral List, and the National Critical Mineral Mission
The chapter covers the Periodic Table — periodic and group properties (alkali metals like Li, transition metals like Co/Ni/Cu, lanthanides = Rare Earth Elements, metalloids like Si/Ge). India's Critical Minerals List 2023 is essentially a strategic re-grouping of these same periodic table elements based on supply-chain criticality for clean energy and defence.
Key Terms — Critical Minerals:
| Term | Meaning |
|---|---|
| Critical Minerals | Elements/minerals that are (1) essential for the economy/national security and (2) have high supply-chain risk; defined per country's strategic context |
| Rare Earth Elements (REEs) | 17 elements: 15 lanthanides (La to Lu) + Scandium (Sc) + Yttrium (Y); essential for magnets, batteries, electronics |
| KABIL (Khanij Bidesh India Ltd) | Joint venture of NALCO + HCL + MECL (40:30:30) under Ministry of Mines; incorporated August 2019; mandate = acquire overseas critical mineral assets |
| NCMM (National Critical Mineral Mission) | India's mission for critical mineral security; Cabinet approved 29 January 2025; outlay ₹34,300 crore over 7 years |
| MMDR Amendment Act 2023 | Mines and Minerals (Development and Regulation) Amendment Act 2023; added 24 critical/strategic minerals to central auction list |
| Battery minerals | Lithium (Li), Cobalt (Co), Nickel (Ni), Manganese (Mn), Graphite — essential for Li-ion batteries |
[Additional] Critical Minerals — Periodic Table to Geopolitical Strategy (GS3 — Economy / Science and Technology):
India's Critical Minerals List 2023 — the 30 minerals:
| Group | Minerals |
|---|---|
| Energy transition | Lithium (Li), Cobalt (Co), Nickel (Ni), Copper (Cu), Graphite, Silicon (Si) |
| Rare Earths (1 group entry covering 17 elements) | REE (Rare Earth Elements) — La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y |
| Strategic/Defence | Beryllium (Be), Niobium (Nb), Tantalum (Ta), Titanium (Ti), Tungsten (W), Vanadium (V) |
| Electronics | Gallium (Ga), Germanium (Ge), Indium (In), Tellurium (Te), Selenium (Se), Cadmium (Cd) |
| Metals/Other | Antimony (Sb), Bismuth (Bi), Hafnium (Hf), Molybdenum (Mo), Platinum Group Elements (PGE), Rhenium (Re), Strontium (Sr), Tin (Sn), Zirconium (Zr) |
| Fertiliser/agri | Phosphorus (P), Potash (K) |
| Total | 30 minerals identified by Ministry of Mines, released 28 June 2023 |
National Critical Mineral Mission (NCMM) — key facts:
| Parameter | Detail |
|---|---|
| Cabinet approval | 29 January 2025 |
| Outlay | ₹34,300 crore over 7 years |
| Split | ₹16,300 crore (Government) + ₹18,000 crore (PSU + private investment) |
| Mission period | FY 2024-25 to FY 2030-31 |
| Nodal | Ministry of Mines |
| Domestic exploration target | 1,200 exploration projects by 2030-31 |
| Recycling target | Recovery of 400 kt recycled material; ₹1,500 crore incentive for recycling |
| Self-sufficiency goal | Processing capability for 5 critical minerals domestically |
KABIL — overseas mineral acquisitions:
| Parameter | Detail |
|---|---|
| Full name | Khanij Bidesh India Ltd ("Foreign Minerals India Ltd") |
| Incorporated | August 2019 |
| JV partners | NALCO (40%) + HCL (30%) + MECL (30%) |
| Parent ministry | Ministry of Mines (NOT External Affairs) |
| First overseas asset | Argentina lithium block agreement — January 2024 (5 lithium blocks via JV with CAMYEN, Catamarca province) |
| Other countries targeted | Australia (Li, Co); Chile, Bolivia (Li); Africa (REEs, Co) |
Why critical — strategic context:
| Resource | India's import dependence | Primary global supplier |
|---|---|---|
| Lithium | ~100% imported | Australia, Chile, Argentina (Lithium Triangle) |
| Cobalt | ~100% imported | DR Congo (>60% of world supply) |
| REE | ~100% imported | China (~60% mining, ~85% processing globally) |
| Nickel | High import dependence | Indonesia, Philippines |
| Strategic risk | China dominates processing of nearly all critical minerals — concentration risk |
Where India's critical minerals are found domestically:
| Mineral | Indian deposit |
|---|---|
| Lithium (Li) | GSI confirmed 5.9 million tonnes indicated resource in Reasi district, Jammu & Kashmir (announced February 2023); also potential in Rajasthan |
| REE (monazite) | Beach sands of Kerala, Tamil Nadu, Odisha (Bhabha Atomic Research Centre extracts) |
| Graphite | Arunachal Pradesh, Tamil Nadu, Jharkhand |
| Titanium | Beach sands of Kerala (ilmenite, rutile) |
| Cobalt | Limited; some in Odisha laterites |
UPSC synthesis: Key exam facts: India's first Critical Minerals List = 28 June 2023 = Ministry of Mines = 30 minerals; REE counts as 1 entry (covering 17 elements: 15 lanthanides + Sc + Y); NCMM Cabinet approved 29 January 2025 = outlay ₹34,300 crore = mission period FY 2024-25 to FY 2030-31; KABIL incorporated August 2019 = NALCO + HCL + MECL JV = Ministry of Mines; KABIL signed Argentina lithium deal January 2024; Reasi (J&K) lithium = 5.9 MT indicated resource (Feb 2023); MMDR Amendment Act 2023 added 24 minerals to central auction list. Prelims trap: REE is 17 elements (15 lanthanides + Sc + Y) but counts as ONE entry in India's 30-mineral list; KABIL parent ministry = Mines (NOT External Affairs, NOT Commerce); NCMM outlay ₹34,300 cr is the TOTAL (govt ₹16,300 cr + PSU ₹18,000 cr) — the government component alone is ₹16,300 cr; J&K Reasi lithium = 5.9 MT (this is "indicated resource," NOT proven reserves — confirmation through G3 stage exploration ongoing); critical mineral list released by Ministry of Mines (NOT NITI Aayog, NOT DRDO).
Exam Strategy
Prelims traps:
- Mendeleev arranged elements by atomic mass — he did NOT know about atomic numbers. Moseley (1913) provided the atomic number basis for the modern periodic table.
- Fluorine (F) is the most electronegative element (not oxygen) — and it is also the most reactive non-metal.
- Hydrogen is placed in Group 1 in most periodic tables but it is NOT an alkali metal — it is a non-metal. Its placement is a matter of convention; it could also be placed in Group 17 (it needs 1 electron like halogens) or kept separate.
- Mercury (Hg) is a transition metal (d-block) — not a non-metal. It is the only liquid metal at room temperature.
- REEs (rare earth elements) are NOT in the main body of the periodic table — they are the lanthanide series in the f-block, usually shown as a separate row below the main table (along with actinides).
- Gallium (Ga) was Mendeleev's predicted eka-aluminium — it was discovered in 1875, validating Mendeleev's predictions and cementing the periodic table's scientific credibility.
- India's three-stage nuclear programme: Stage 1 = PHWRs using natural uranium; Stage 2 = FBRs using Pu-239 (bred from U-238); Stage 3 = Advanced Heavy Water Reactors using U-233 bred from thorium (India's most abundant nuclear fuel).
Mains frameworks:
- REEs → clean energy technology → China's geopolitical leverage → India's Critical Mineral Mission → KABIL → strategic stockpiling → mineral diplomacy with Australia, Japan, USA (Quad minerals cooperation)
- Semiconductor → digital economy → chip dependency → India Semiconductor Mission → Tata fab → Make in India → national security (dual-use chips)
- Thorium → India's 3-stage nuclear programme → BARC → PFBR → energy security → low-carbon baseload electricity
Practice Questions
Prelims:
With reference to India's semiconductor policy, which of the following statements is/are correct?
(a) India has been manufacturing advanced microchips for over a decade
(b) India Semiconductor Mission provides incentives for chip fabrication and assembly units in India
(c) Silicon is being replaced entirely by graphene in all semiconductor applications
(d) India's first chip fabrication plant is located in HyderabadWhich of the following are classified as Rare Earth Elements (REEs)?
(a) Iron, Cobalt, Nickel
(b) Lithium, Cobalt, Manganese
(c) Neodymium, Lanthanum, Cerium, Dysprosium
(d) Silicon, Germanium, Gallium
Mains:
What are rare earth elements (REEs)? Discuss China's dominance in REE supply chains and how India is addressing the challenge of securing critical mineral supplies for its clean energy transition. (CSE Mains 2023, GS Paper 3, 15 marks)
Discuss the significance of India's three-stage nuclear programme. How does India's large thorium reserve fit into its long-term energy security strategy? (CSE Mains 2020, GS Paper 3, 15 marks)
