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Question

The electronic configurations of Eu (Atomic No.63) Gd Atomic No. 64) and Tb (Atomic No. 65) are :

A
[Xe]4f76s2,[Xe]4f75d16s2and [Xe]4f96s2
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B
[Xe]4f65d16s2,[Xe]4f75d16s2and [Xe]4f85d16s2
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C
[Xe]4f76s2,[Xe]4f86s2and [Xe]4f85d16s2
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D
[Xe]4f65d16s2,[Xe]4f75d16s2and [Xe]4f95d16s2
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Solution

The correct option is A [Xe]4f76s2,[Xe]4f75d16s2and [Xe]4f96s2
63Eu[Xe]4f76s2
64Gd[Xe]4f75d16s2
65Tb[Xe]4f95d06s2
Gd possesses a single electron in the 5d subshell. In the case of other lanthanoids, the 5d orbital is empty.
Option (a) is correct

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