Give reason why H2+ ions are more stable than H2- though they have the samebond order.

Bond order of =2-1/2 =0.5

Bond order of =3-2/2=0.5

But in case of    there is only one electron in antibonding orbital while there are two electrons in case of . Thus is less stable . 

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this is because of the presence of one electron in its anti bonding orbital due to which the destablising effect is more and hence the stability is less

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