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Question: Answered & Verified by Expert
In which of the following elements number of $d$-electrons is zero in $6 d$-orbital?
Chemistryd and f Block ElementsAIIMSAIIMS 2018 (27 May)
Options:
  • A Th
  • B $\mathrm{Cm}$
  • C Lr
  • D Am
Solution:
2172 Upvotes Verified Answer
The correct answer is: Am
$\begin{aligned} & \text { : Th: }[\mathrm{Rn}] 6 d^2 7 s^2 \\ & \mathrm{Cm}:[\mathrm{Rn}] 5 f^7 6 d^1 7 s^2 \\ & \mathrm{Lr}:[\mathrm{Rn}] 5 f^{14} 6 d^1 7 s^2 \\ & \mathrm{Am}:[\mathrm{Rn}] 5 f^7 7 s^2\end{aligned}$

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