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Q.

The element with highest number of unpaired electrons is

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a

Gd

b

Ce

c

Sm

d

Eu

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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The element with highest number of unpaired electrons is