With the help of molecular orbital theory predict which of the following species are diamagnetic ?
`H_(2)^(+),O_(2)O_(2)^(2+)`

Explanation

The diamagnetic species are those which contain only paired electrons. This can be predicted from the molecular orbital electronic configurations as given below :
`H_(2)^(+):(sigma1s)^(1)`
`O_(2)^(+):KK(sigma2s)^(2)(sigma^(**)2s)^(2)(sigma2p_(z))^(2)(pi2p_(x))^(2)(pi2p_(y))^(2)(pi^(**)2p_(x))^(1)(pi^(**)2p_(y))^(1)`
`O_(2)^(2+):KK(sigma2s)^(2)(sigma^(**)2s)^(2)(sigma2p_(x))^(2)(pi2p_(x))^(2)(pi2p_(y))^(2)`
Since `O_(2)^(2+)` contain all paired electrons, it will be diamagnetic.