1.

Stability of the species Li2​ , Li2−​and Li2+​increases in the order:

Answer»

`Li_(2)lt Li_(2)^(+)lt Li_(2)^(-)`
`Li_(2)^(-)lt Li_(2)^(+)lt Li_(2)`
`Li_(2)lt Li_(2)^(-)lt Li_(2)^(+)`
`Li_(2)^(-)lt Li_(2)lt Li_(2)^(+)`

Solution :STABILITY DEPENDS upon bond order :
`Li_(2) : KK (sigma_(2s))^(2)B.O = 1`
`Li_(2)^(+) : KK(sigma_(2s))^(1)B.O=0.5`
`Li_(2)^(-): KK (sigma_(2s))^(2)(sigma_(2s)^(**))^(1)B.O=0.5`
`Li_(2)^(+)` is more stable than `Li_(2)^(-)` because it has LESS NUMBER of antibonding electrons. HENCE,`Li_(2)^(-)lt Li_(2)^(+)lt Li_(2)`.


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