Answer:
Hydrogen atom (Z = 1) has only one
electron present in the s-orbital\[(1{{s}^{1}})\]. The two such half filled
atomic orbitals combine to form a molecular orbital which contains both these
electrons. But helium (Z = 2) has already a filled orbital \[(1{{s}^{2}})\].
Therefore, the atomic orbitals of the helium atoms do not combine. Thus, a
molecule of\[{{H}_{2}}\] exists while that of \[H{{e}_{2}}\] does not.
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