Q.

The atomic radius of elements of which of the following series would be nearly the same

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a

Na, K , Rb , Cs

b

Li , Be , B , C

c

Fe, Co, Ni, Cu

d

F ,Cl, Br, I

answer is C.

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Detailed Solution

Fe, Co, Ni, Cu. Due to shielding of d-electrons, the effect of increased nuclear charge due to increase in atomic no. neutralized. Consequently atomic radius remains almost unchanged after chromium.
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The atomic radius of elements of which of the following series would be nearly the same