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. neutralised. 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