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Chemistry · Structure of atom

हिन्दी

What is the correct ground-state valence electronic configuration of chromium (\( \text{Cr}, Z = 24 \)) exhibiting exceptional stability?

  1. A
    \( [Ar] 3d^4 4s^2 \)
  2. B
    \( [Ar] 3d^5 4s^1 \)
  3. C
    \( [Ar] 3d^6 4s^0 \)
  4. D
    \( [Ar] 3d^3 4s^3 \)

Correct answer · Option B

\( [Ar] 3d^5 4s^1 \)

Explanation

Half-filled and fully filled subshells possess extra stability due to symmetry and higher exchange energy, leading to \( 3d^5 4s^1 \) configuration for \( \text{Cr} \).
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