Total number of species which has/ have symmetrical electronic distribution in their HOMO and also paramagnetic.
`N_(2)^(+), O_(2)^(2-), C_(2), O_(2), B_(2), C_(2)^(2-), N_(2)^(2-)`.

Answer

`4`

Explanation

`N_(2)^(+), O_(2), B_(2), N_(2)^(2-)` have symmetrical electronic distribution in their HOMO and are also paramagnetic.
`N_(2)^(+)` paramagnetic and symmetrical electronic distribution in their HOMO
`O_(2)` paramagnetic and symmetrical electronic distribution in their HOMO
`B_(2)` paramagnetic and symmetrical electronic distribution in their HOMO
`N_(2)^(2-)` paramagnetic and symmetrical electronic distribution in their HOMO
`O_(2)^(2-)` paramagnetic and symmetrical electronic distribution in their HOMO
`C_(2)` paramagnetic and symmetrical electronic distribution in their HOMO
`C_(2)^(2-)` paramagnetic and symmetrical electronic distribution in their HOMO