How does velence bond theory, explain the existence of H_(2) but non-e

1.	How does velence bond theory, explain the existence of H_(2) but non-existence of H_(2)?
Answer» Solution :According to VALENCE bondtheory, a covalent bond is FORMED by OVERLAP of half-filled ATOMIC orbitals : H-atoms have half-filled orbitals `(1s^(1))` but He atoms have fully filled orbitals `(1s^(2))`.

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