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A type of bond where two atoms share a pair of electrons. To indicate this, one simple C-H bond or the C-C double bond is often written as C:H and C :: C. For this reason, the term electron pair bond is in use. Multiple covalent bonds reduce the distance between the atoms and more energy is required to break these bonds. The illustration shows the electron pair bonds of ethane (C2 H6) and ethylene (C2 H4). The former has a single covalent bond (2 electrons), the latter has two (4 electrons). At a distance of the carbon atoms of 1.3 Å (angstroms), the binding is tighter than the ethylene in the ethane (1.5 Å distance), and thus more stable.