Question

According to molecular orbital theory, which of the following does not exist?

• A. $H_2^{2-}$
• B. $H{e}_2^{2-}$
• C. $H{e}_2^{+}$
• D. $H_2^{-}$

Answer 1

The correct option is A $H_2^{2-}$

Species	Bond order
$H_2^{2-}$	0 (does not exist)
$H{e}_2^{2-}$	1 (exists)
$H{e}_2^{+}$	0.5(exists)
$H_2^{-}$	0.5(exists)