Which pair of elements belongs to same group ?

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Elements with at. no. 17 and 38

Elements with at. no. 20 and 40

Elements with at. no. 17 and 53

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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