CUET · CHEMISTRY · PYQ PAPER 2025
Derive the electronic configuration of \(Ce ^{3+}\) ion by using Hund's rule.
- A \([ Xe ] 4 f^1 5 d^1 6 s^2\)
- B \([ Xe ] 4 f^1\)
- C \([ Rn ] 5 f^2 6 d^1 7 s^2\)
- D \([ Rn ] 5 f^1\)
Answer & Solution
Correct Answer
(B) \([ Xe ] 4 f^1\)
Step-by-step Solution
Detailed explanation
\(Ce\) (\(Z=58\)): \([ Xe ] 4 f^1 5 d^1 6 s^2\) Remove 3 electrons for \(Ce^{3+}\) (first \(6s^2\), then \(5d^1\)): \([ Xe ] 4 f^1\)
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