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Q.

Which of the following series of elements have most nearly the same atomic radius ?

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a

Mg, Ca, Sr, Ba

b

Ca, Ge, As, Se

c

B, C, N, O

d

Cr, Mn, Fe, Co

answer is D.

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Detailed Solution

The elements Cr, Mn, Fe, Co have a differentiating electron in the d subshell which gives it a poor screening effect and they have most nearly the same atomic radius.

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