Question
How is hydrogen molecule formed?
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Answer
The atomic number of hydrogen is $1,$ its atom contains $1$ electron in $K$ shell. It requires one more electron to complete the $K$ shell and attain the configuration of helium (He). To meet this requirement two hydrogen atoms share their electrons with each other to form $H_2$ molecule. One covalent bond, i.e. a single bond is formed between two hydrogen atoms by sharing of two electrons.
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