A Nitrogen got 7 electrons, which means every Nitrogen got 3 pairs of electrons and 1 single electron, ready to be shared. A second nitrogen come with the same amount of electrons, 3 pairs and 1 single ready to shared. The 2 nitrogens put in common their single electrons to create a pair. Which means, that 1 pair of electron is shared between the nitrogens in a molecule of N2
