Chemical Bonding and Molecular Structure

Question

# According to molecular orbital theory, which of the following will not be a viable molecule?${H}_{2}^{2-}$ $H{e}_{2}^{2+}$ $H{e}_{2}^{+}$ ${H}_{2}^{-}$

${H}_{2}^{2-}$
 Species Bond Order ${H}_{2}^{2-}$ 1/2[2-2] = 0 (does not exist) $H{e}_{2}^{2+}$ 1/2[2-0] = 1 (Exist) $H{e}_{2}^{2-}$ 1/2 [2-1] = 0.5 (Exist) ${H}_{2}^{-}$ 1/2 [ 2-1] = 0.5 (Exist)