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Q.

The element with the electronic configuration $(X e) 4 f^{7} 5 d^{1} 6 s^{2}$ lies in the

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a

s-block

b

d-block

c

f-block

d

Actinides series

answer is C.

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Detailed Solution

$(X e) 4 f^{7} 5 d^{1} 6 s^{2}$ is gadolinium $4 f$ series and f-block element.

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