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Each nitrogen atom has 5 . When two nitrogen atoms bind to form the dinitrogen molecule, each atom provides 3 electrons to give the treble bond, and the remaining pair of electrons is a non- lone pair, i.e. to give $:N-=N:$.

Typically a single covalent bond results from the sharing of 2 electrons between 2 atoms, e.g. $H_3C-CH_3$, and a double covalent bond results from the sharing 4 electrons between 2 atoms..........e.g. $H_2C=CH_2$.

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