A covalent bond forms when two non-metal atoms share a pair of electrons. The electrons involved are in the highest occupied energy levels - or outer shells - of the atoms. An atom that shares one or more of its electrons will complete its highest occupied energy level.
Covalent bonds are strong - a lot of energy is needed to break them. Substances with covalent bonds often form molecules with low melting and boiling points, such as hydrogen and water.
A covalent bond can be represented by a straight line or dot and cross diagram.
A covalent bond is formed when two atoms share a pair of electrons.
The number of covalent bonds an atom forms depends on the number of electrons it needs to achieve a stable electron arrangement.
Many covalently bonded substances consist of small molecules, but some have giant structures.
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