Which of the following species has unpaired electrons?

Options

A. `N_(2)`
B. `F_(2)`
C. `O_(2)^(Theta)`
D. `O_(2)^(2-)`

Answer

C

Explanation

`O_(2)^(Theta)` has `(8 +8 +1) =17 e^(-')s` so it has at least one unpaired `e^(-)` which makes it paramagnetic
Number of `e^(-')s` in `N_(2) = 7 +7 =14`
Number of `e^(-')s` in `F_(2) = 9 + 9 =18`
Number of `e^(-')s` in `O_(2)^(2-) =8 +8 +2 =18`
All of them have even number of `e^(-')s` so they do not have unpaired `e^(-')s` hence are diamagnetic .