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JEE Main · 2025 · 07 Apr 2025 · Shift 1 · d and f Block Elements

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The number of valence electrons present in the metal among and Ni which has the lowest enthalpy of atomisation is
  1. (A)8
  2. (B)9
  3. (C)6✓ Correct
  4. (D)10

Answer: (C)

Solution

Among chromium, cobalt, iron and nickel, chromium has the lowest enthalpy of atomisation, its half-filled arrangement weakening the metallic bonding. Chromium has the configuration , giving five plus one, that is six, valence electrons. The number of valence electrons is 6.

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Single correct option

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