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Q.

The element with highest number of unpaired electrons is

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a

Eu

b

Ce

c

Sm

d

Gd

answer is A.

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Detailed Solution

Gd - 4f7 5d1 6s1

Ce - 4f1 5d1 6s2

Sm - 4f6 6s2

Eu - 4f7 6s2

So, Gd is the element with the highest number of unpaired electrons.

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