Home Chemistry D and F - Block Elements General The radii (metallic) of Fe,Co and Ni are nea…
Chemistry D and F - Block Elements General Single Correct MCQ
Published on: August 13, 2026

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

A
Lanthanide contraction
B
The fact that successive additions of d–electrons screen the outer electrons (4s) from the inward pull of the nucleus.
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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