Gadolinium (Gd, ) is a highly tested exception in the f-block. What is its exact ground-state electr — Periodic Table and Periodicity Chemistry Question
Question
Gadolinium (Gd, $Z=64$) is a highly tested exception in the f-block. What is its exact ground-state electronic configuration?
Answer: B
💡 Solution & Explanation
To maintain the extra stability of an exactly half-filled $4f^7$ subshell, the next electron enters the $5d$ subshell, resulting in $[Xe] 4f^7 5d^1 6s^2$.
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