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Question

The pair of atomic numbers belonging to the same group are:
11, 20
12, 30
13, 31
14, 33

A

13, 31

B

14, 33

C

11, 20

D

12, 30

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Solution

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$Z = 13 [N e] 3 s^{2} 3 p^{1}$
$Z = 31 [A r] 3 d^{10} 4 s^{2} 4 p^{1}$
As valence electronic configuration is same, they belong to same group.

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