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The change of \mathrm{O}_2  to  \mathrm{O}_2^{-} ion will _________

Option: 1

increase the number of unpaired electrons
 


Option: 2

decrease the number of unpaired electrons
 


Option: 3

have no effect on the number of unpaired electrons
 


Option: 4

increase the bond order


Answers (1)

best_answer

The configuration of \mathrm{\mathrm{O}_2} is:

\mathrm{ \sigma(1 s)^2 \sigma^*(1 s)^2 \sigma(2 s)^2 \sigma^*(2 s)^2 \sigma\left(2 p_z\right)^2 \pi\left(2 p_x\right)^2 \pi\left(2 p_y\right)^2 \pi^*\left(2 p_x\right)^1 \pi^*\left(2 p_y\right)^1 }

The configuration of \mathrm{O_2^{-}} is:

\mathrm{ \sigma(1 s)^2 \sigma^*(1 s)^2 \sigma(2 s)^2 \sigma^*(2 s)^2 \sigma\left(2 p_z\right)^2 \pi\left(2 p_x\right)^2 \pi\left(2 p_y\right)^2 \pi^*\left(2 p_x\right)^2 \pi^*\left(2 p_y\right)^1 }

The change of \mathrm{O}_2 to \mathrm{O}_2{ }^{-} ion will decrease the number of unpaired electrons. This is because the electron will be added to the \sigma *  orbital, which is an antibonding orbital. Antibonding orbitals do not have any unpaired electrons, so the addition of an electron to this orbital will decrease the number of unpaired electrons.

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