Questions
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
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Correct option is C
Each has ns2np5 configuration.Cl(Z=17) and I(Z=53) belong to 17th group.
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