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

1.	How does velence bond theory, explain the existence of `H_(2)` but non-existence of `H_(2)`?
Answer» According to valence bond theory, 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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How does velence bond theory, explain the existence of `H_(2)` but non-existence of `H_(2)`?

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