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Explain the formation of $H_{2}$ molecule on the basis of valence bond theory.

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Solution

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The elecronic confguration of hydrogen is $1 s^{1}$ .

Thus, it contains one unpaired electron in 1s orbital.

Two H atoms, each having one unpaired electron, combine and share their electron to form a covalent bond in which two electrons are paired.

$H \cdot + H \cdot \to H \cdot \cdot H$

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