1.

The correct order of atomic radii is : (1) Ce > Eu > Ho > N (2) Eu > Ce > Ho > N (3) Ho > N > Eu > Ce (4) N > Ce > Eu > Ho

Answer»

Correct option: (2) Eu > Ce > Ho > N

Explanation:

Atomic radic gradually decrease along the series. If we consider the atomic (i.e., metallic) radii for the lanthanides, two peaks appear at (63Eu [Xe] 4f7 5d0 6s2) and 70Yb [Xe] 4f14 5d0 6s2

Eu and Yb each can provide only 2 electrons for metallic bonding while the other members each can provide 3e for the bonding purpose.



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