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The gradual decrease in metallic radius for lanthanoids is not obeyed by :

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Gd and Tb

Eu and Yb

Lu and Tb

Sm and Pm

answer is B.

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Detailed Solution

If we consider atomic radii for the lanthanoids two peaks appear at ₆₃Eu and ₇₀Yb ; Eu and Yb each can provide only two electrons for metallic bonding while the other members can provide three electrons for the bonding purpose.

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