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Q.

Which pair of elements belongs to same group ?

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a

Elements with at. no. 17 and 38

b

Elements with at. no. 20 and 40

c

Elements with at. no. 17 and 53

d

Elements with at. no. 11 and 33

answer is C.

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Detailed Solution

Each has ns2np5 configuration.Cl(Z=17) and I(Z=53) belong to 17th group.
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Which pair of elements belongs to same group ?