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

Li₂ < Li₂⁺ < Li₂^-

Li₂⁻ < Li₂⁺ < Li₂

Li₂< Li₂⁻ < Li₂⁺

Li₂⁻ <Li₂< Li₂⁺

Solution

Li₂⁻ < Li₂⁺ < Li₂

Li subscript 2 left parenthesis 6 right parenthesis space equals space straight sigma 1 straight s squared space straight sigma asterisk times 1 straight s squared straight sigma 2 straight s squared straight B. straight O space equals space fraction numerator 4 minus 2 over denominator 2 end fraction space equals space 1 Li subscript 2 superscript plus space left parenthesis 5 right parenthesis space equals space straight sigma 1 straight s squared space straight sigma asterisk times 1 straight s squared straight sigma 2 straight s to the power of 1 straight B. straight O space equals space fraction numerator 3 minus 2 over denominator 2 end fraction space equals 0.5 Li subscript 2 superscript minus space left parenthesis 7 right parenthesis space space equals space space straight sigma 1 straight s squared space straight sigma asterisk times 1 straight s squared straight sigma 2 straight s squared straight sigma asterisk times 2 straight s to the power of 1 straight B. straight O space equals space fraction numerator 4 minus 3 over denominator 2 end fraction space equals space 0.5

Li₂⁺ is more stable than Li₂⁻ because Li₂⁻ has more numbers of antibonding electrons.

Delhi University