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In page Covalent bond:

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The simplest example of three-electron bonding can be found in the helium dimer cation, He+2. It is considered a "half bond" because it consists of only one shared electron (rather than two);[2] in molecular orbital terms, the third electron is in an anti-bonding orbital which cancels out half of the bond formed by the other two electrons. Another example of a molecule containing a 3-electron bond, in addition to two 2-electron bonds, is nitric oxide, NO. The oxygen molecule, O2 can also be regarded as having two 3-electron bonds and one 2-electron bond, which accounts for its paramagnetism and its formal bond order of 2.[3] Chlorine dioxide and its heavier analogues bromine dioxide and iodine dioxide also contain three-electron bonds.