First slide

Predicting position of element in modern periodic table

Question

Which pair of elements belongs to same group ?

Easy

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

Solution

Each has ns²np⁵ configuration.
Cl(Z=17) and I(Z=53) belong to 17^thgroup.

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