Q.

The outer electron configuration of Gd (Atomic No.64) is

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a

4f35d56s2

b

4f85d106s2

c

4f45d46s2

d

4f75d16s2

answer is D.

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Detailed Solution

one electron shuffles from 4f to 5d for stablility
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The outer electron configuration of Gd (Atomic No.64) is