A chemical bond between two or more non-metal atoms (these can be from the same element or from different elements as long as they are both non-metals.)
It involves the sharing of an electron. If both atoms need on electron to get a full outer shell they share an electron and become joined. They share a pair of electrons and now both have a full outer shell.
More than one other atom can join to one atom; if an atom need two electrons, two other atoms will join to share two pairs of electrons. In this case the two atoms will be different to the atom needing two electrons. See above right.
These are all now SIMPLE MOLECULAR COMPOUNDS with strong bonds. However covalent bonding can also form giant covalent structures such as diamonds or graphite.
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