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Why does hydrogen occur in a diatomic form rather than in monoatomic form under normal conditions?

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  • Hydrogen atom has only one electron in its valence shell having electronic configuration 1s1
  • 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 H2 rather than in monoatomic form.

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