Home Chemistry D and F - Block Elements Mix The radii (metallic) of Fe,Co and Ni are nea…
Chemistry D and F - Block Elements Mix Single Correct MCQ
Published on: August 14, 2026

The radii (metallic) of Fe,Co and Ni are nearly same. This is due to the fact that:

A
lanthanide contraction
B
increased interelectronic repulsion is balanced by increased nuclear charge.
C
increase in radii due to increase in 'n' is compensated by decrease in radii due to increase in effective nuclear charge (Z).
D
atomic radii do not remain constant but decrease in a normal gradation.

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The correct answer is:
B

After mid way i.e. after Cr as the electrons enters the last but one shell, the added d-electron shields the outer most electrons. Hence with the increase in the d-electrons screening effect increases. This counter balances the increased nuclear charge. As a result, the atomic radii remain practically same after chromium.

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