Three-center bond
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In chemistry, a three-center bond is a type of covalent bond, in which one pair of electrons joins three atoms rather than the usual two.
This type of bond is seen in many boron compounds, for example diborane, B2H6. The monomer BH3 is unstable since the boron atom is only surrounded by six valence electrons. To complete its octet, it shares electrons with a B-H bond in another molecule.
