NEET · Chemistry · STD 12 - 4. d and f- block elements
The electronic configurations of \(Eu\) (Atomic No. \(63\)), \(Gd\) (Atomic No. \(64\)) and \(Tb\) (Atomic No. \(65\)) are
- A \([Xe]4f^6\,5d^1\,6s^2,\) \([Xe]4f^7\,5d^1\,6s^2\) and \([Xe]4f^8\,5d^1\,6s^2\)
- B \([Xe]\,4f^7\,6s^2\), \([Xe]\,4f^7\, 5d^1\, 6s^2\) and \( [Xe]\,4f^9 \,6s^2\)
- C \([Xe]\,4f^7 \,6s^2\), \([Xe]\,4f^8\, 6s^2\) and \([Xe]\,4f^8 \,5d^1\, 6s^2\)
- D \([Xe]\,4f^6\, 5d^1 \,6s^2,\) \( [Xe]\,4f^7\, 5d^1 \,6s^2\) and \([Xe]\,4f^9 \,6s^2\)
Answer & Solution
Correct Answer
(B) \([Xe]\,4f^7\,6s^2\), \([Xe]\,4f^7\, 5d^1\, 6s^2\) and \( [Xe]\,4f^9 \,6s^2\)
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