First slide

Molecular Orbital Theory

Question

Which one of the following species cannot exist ?

Moderate

A

$C_{2}^{2 -}$
B

${He}_{2}$
C

$H_{2}^{-}$
D

All of these

Solution

${He}_{2} - {(σ_{1 s})}^{2} {(σ_{1 s}^{*})}^{2}; Bond order = \frac{2 - 2}{2} = 0; {He}_{2} cannot exist;$

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