Which of the following species exhibits the diamagnetic behaviour ?

Options

A. `O_(2)^(2-)`
B. `O_(2)^(+)`
C. `O_(2)`
D. `NO`

Answer

a

Explanation

This species has `18e`, which are filled in such a way that all molecular orbitals are fully , so diamagenetic
`O_(2)^(2) = sigma_1s^(2), sigma**_1s^(2),sigma_2s^(2) sigma **2s^(2),sigma2p_(z)^(2),pi 2p_(y)^(2), pi **2p_(x)^(2), , pi 2p_(3)^(2), pi **2p_(x^(2)), pi**2p_(y)^(2)`