# Elements A,B, C,D and E have following electronic configurations :(A) $1{s}^{2},2{s}^{2}2{p}^{1}$ (B) $1{s}^{2},2{s}^{2}2{p}^{6},3{s}^{2}3{p}^{1}$ (C) $1{s}^{2},2{s}^{2}2{p}^{6},3{s}^{2}3{p}^{3}$ (D) $1{s}^{2},2{s}^{2}2{p}^{6},3{s}^{2}3{p}^{5}$(E) $1{s}^{2},2{s}^{2}2{p}^{6},3{s}^{2}3{p}^{6}$Which among the belongs to  same  group in the periodic table?

1. A

A and C

2. B

A and D

3. C

A and E

4. D

A and B

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### Solution:

The electronic configuration of Boron is,

$1{s}^{2},2{s}^{2}2{p}^{1}$
The electronic configuration of Aluminum is,

$1{s}^{2},2{s}^{2}2{p}^{6},3{s}^{2}3{p}^{1}$

Both belongs to same group in the periodic table.

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