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

1.	The radii (metallic) of Fe, Co and Ni are nearly same. This is due to
A.	lanthanide contraction
B.	the fact that successive addition 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
Answer» C. increase in radii due to increase in 'n' is compensated by decrease in radii due to increase in effective nuclear charge (Z)

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

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