Chemical Bonding And Molecular Structure

$\mathrm{He}_2, \mathrm{Ne}_2$ only

$\mathrm{Li}_2^{2-}, \mathrm{Ne}_2, \mathrm{He}_2$ only

$\mathrm{Be}_2^{-}, \mathrm{He}_2, \mathrm{Ne}_2$ only

$\mathrm{H}_2^{+}, \mathrm{L}_2^{2-}$ only