During change of `O_(2)` to `O_(2)^(2-)` ion, the electrons add on which of the following orbitals ?

Options

A. `overset(**)(pi)`-orbital
B. `pi`-orbital
C. `overset(**)(sigma)`-orbital
D. `sigma`-orbital

Answer

A

Explanation

During change of `O_(2)` to `O_(2)^(-)`, the electronic configuration of `O_(2)`
(total `e^(-)=16`) is
`sigma(1s^(2)),overset(**)(sigma)(1s^(2)),sigma(2s^(2)),overset(**)(sigma)(2s^(2)),sigma(2p_(z)^(2))`
`pi(2p_(x)^(2))~~pi(2p_(y)^(2)),overset(**)(pi)(2p_(x)^(1))~~ overset(**)(pi)(2p_(y)^(1))`
and configuration of `O_(2)^(-)`,
(total `e^(-)=17`)
`sigma(1s^(2)),overset(**)(sigma)(1s^(2)),sigma(2s^(2)),overset(**)(sigma)(2p_(z)^(2)),pi(2p_(x)^(2))`
`~~pi(2p_(y)^(2)),overset(**)(pi)(2p_(x)^(2))~~overset(**)(pi)(2p_(x)^(2))`