MCQ
Electronic configuration of $Gd(64)$ is
- A$[Xe]\, 4f^2,\,5d^9,\,6s^2$
- ✓$[Xe]\, 4f^7,\,5d^1,\,6s^2$
- C$[Xe]\, 4f^6,\,5d^2,\,6s^2$
- D$[Xe]\, 4f^7,\,5d^0,\,6s^2$
Therefore, addition of next electron doesn't occur in a more stable exactly halffilled $4 f ^7$ shell but occur in a little higher energy $5 d$-orbital. Thus, the electronic configuration of $Gd ( Z =64)$ is [Xe] $4 f ^7 5 d ^1 6 s ^2$.
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