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Bond formation in ammonia molecule. Illustration of the sharing of electrons (dots and crosses) between three hydrogen (H) and one nitrogen (N) atom to form a molecule of ammonia (NH3). This is an example of covalent bonding, with the three single bonds formed by a shared electron pair consisting of an electron from each atom. The outer electron shell of each atom is shown as a blue ring. Ammonia is a gas at room temperature and pressure. The bonds are not shown here. For the fully bonded molecule, see image C028/6487.
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