Question

Group the following electronic configurations in pairs that would have different chemical properties of their atoms
(a) ${1s}^2,{2s}^2,{2p}^5$
(b) ${1s}^2,{2s}^1$
(c) ${1s}^2,{2s}^2,{2p}^6$
(d)${1s}^2,{2s}^2,{2p}^6,{3s}^2,{3p}^5$
(e) ${1s}^2,{2s}^2,{2p}^6,{3s}^2,{3p}^6,{4s}^1$
(f) ${1s}^2,{2s}^2,{2p}^6,{3s}^2{3p}^6,{4s}^2,{3d}^{10},{4p}^6$

• A. $\left(a\right)$ & $\left(b\right)$
• B. $\left(a\right)$ & $\left(d\right)$
• C. $\left(b\right)$ & $\left(e\right)$
• D. $\left(c\right)$ & $\left(f\right)$

Answer 1

The correct option is A $\left(a\right)$ & $\left(b\right)$

$a$ and $b$, $c$ and $d$, $e$ and $f$, $a$ and $c$, $a$ and $e$ etc. have different electronic configurations. Hence, they have different chemical properties. Here $a$ is halogen and $b$ is alkali metal.