Question
Why does hydrogen occur in a diatomic form rather than in monoatomic form under normal conditions?
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Answer
Hydrogen atom has only one electron in its valence shell having electronic configuration $1s^1.$
It can acquire stable configuration of helium by sharing this electron with another hydrogen atom.
Therefore, it shares its single electron with electron of the other $H-$atom to achieve stable inert gas configuration of $He$.
Thus, hydrogen readily forms diatomic molecule and exists as $H_2$ rather than in monoatomic form.
It can acquire stable configuration of helium by sharing this electron with another hydrogen atom.
Therefore, it shares its single electron with electron of the other $H-$atom to achieve stable inert gas configuration of $He$.
Thus, hydrogen readily forms diatomic molecule and exists as $H_2$ rather than in monoatomic form.
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