1. Tardigrade
  2. Question
  3. Chemistry
  4. Which of the following has unpaired electron(s)?

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Q. Which of the following has unpaired electron(s)?

NTA AbhyasNTA Abhyas 2022

Solution:

The Molecular orbital electronic configurations are
$O _2^{-} \Rightarrow \sigma 1 s ^2< \overset{*}{\sigma} 1 s ^2<\sigma 2 s ^2<\overset{*}{\sigma} 2 s ^2<\sigma 2 p _{ z }^2<\pi 2 p _{ x }^2=\pi 2 p _{ y }^2<\overset{*}{\pi} 2 p _{ x }^2=\overset{*}{\pi} 2 p _{ y }^1$
(unpaired electron)
$N _2^{2+} \Rightarrow \sigma 1 s ^2<\overset{*}{\sigma} 1 s ^2<\sigma 2 s ^2<\overset{*}{\sigma}2 s ^2<\pi 2 p _{ x }^2=\pi 2 p _{ y }^2<\sigma 2 p _{ z }^0$
$O _2^{2-} \Rightarrow \sigma 1 s ^2<\overset{*}{\sigma} \delta ^2<\sigma 2 s ^2< \overset{*}{\sigma}2 s ^2<\sigma 2 p _{ z }^2<\pi 2 p _{ x }^2=\pi 2 p _{ y }^2<\overset{*}{\pi}2 p _{ x }^2=\overset{*}{\pi} 2 p _{ y }^2$
$N _2 \Rightarrow \sigma 1 s ^2< \overset{*}{\sigma} 1 s ^2<\sigma 2 s ^2< \overset{*}{\sigma} 2 s ^2<\pi 2 p _{ x }^2=\pi 2 p _{ y }^2<\sigma 2 p _{ z }^2$