The type of bond formed depends on the valence electrons (no: of electrons in the outermost shell)
When two atoms share one electron pair between each other, then they are said to be bonded by single covalent bond
When two atoms share two electron pairs between each other, they are said to be bonded by double covalent bond
When two atoms share three electron pairs between each other, they are said to be bonded by triple covalent bond.
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