When a ____ and a non-metal element form a compound, they form an ____ bond by ____ electrons. However, when two non-metal atoms bond together, they do so by ____ bonding. The non-metal atoms share electrons in their ____ shells in such a way as to ensure each atom has a stable, ____ outer electron shell. A covalent bond is a ____ one involving a shared ____ of electrons, one from each of the bonded atoms. A covalent ____ bond is made from two shared pairs of electrons and is formed formed by two atoms each sharing ____ of their outer electrons (e.g. ____). A triple bond occurs when two atoms share three pairs of electrons in their outer shells (e.g. ____). Groups of atoms which have bonded together covalently are called ____.

Covalent bonding

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