Which of the following species has lowest first ionization potential ?

1.	Which of the following species has lowest first ionization potential ?
Answer» O `O_(2)` `O_(2)^(+)` `O_(2)^(-)` Solution :In O-atom , the ELECTRON is to be removed from 2p while in `O_(2) , O_(2)^(+) and O_(2)^(-)` , electron is to be removed from`pi^() (2p_(x)) or pi^() (2p_(y))` which has higher ENERGY and hence less stable . Further , `O_(2)^(-)` is least stable DUE to GREATER number of ELECTRONS in the antibonding molecularorbitals .

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