QJEEM19Ch9d05: JEE Main 2019 Chemistry - Class 11 JEEM19Ch9d05 Solution: According to molecular orbital theory, which of the following…

Question

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According to molecular orbital theory, which of the following is true with respect to Li₂⁺ and Li₂^$-$ ?

Accepted Answer

L i_{2}^{+}

(5 electrons) =

σ_{1 s^{2}} σ_{1 s^{2}}^{*} σ_{2 s^{1}}

L i_{2}^{-}

(7 electrons) =

σ_{1 s^{2}} σ_{1 s^{2}}^{*} σ_{2 s^{2}}

σ_{2 s^{1}}^{*}

∴

Bond order of

L i_{2}^{+}

=

\frac{3 - 2}{2}

= 0.5

Bond order of

L i_{2}^{-}

=

\frac{4 - 3}{2}

= 0.5

As both

L i_{2}^{+}

and

L i_{2}^{-}

has non-zero bond order, so both are stable.

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