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Why Does Hydrogen Occur in a Diatomic Form Rather than in a Monoatomic Form Under Normal Conditions? - Chemistry

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ConceptPosition of Hydrogen in the Periodic Table

Question

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

Solution 1

The ionization enthalpy of hydrogen atom is very high (1312 kJ mol–1). Hence, it is very hard to remove its only electron. As a result, its tendency to exist in the monoatomic form is rather low. Instead, hydrogen forms a covalent bond with another hydrogen atom and exists as a diatomic (H2) molecule.

Solution 2

In diatomic form, the K-shell of hydrogen is complete (1s2) and so it is quite stable.

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Solution Why Does Hydrogen Occur in a Diatomic Form Rather than in a Monoatomic Form Under Normal Conditions? Concept: Position of Hydrogen in the Periodic Table.
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