The bonds in the oxide of boron are covalent, with electron-pair
bonds between B and O. Because each boron atom has three outer-shell
electrons for sharing, whereas each oxygen atom needs two electrons
to share in pair bonds, the ratio of B to O atoms must be 2:3, just
as if the interacting species were
Although the overall composition is ,
there are no isolated
molecules. Instead, each boron atom is surrounded by three oxygen
atoms 120° apart, and these
triangles are linked by sharing corner oxygens, as shown at the
The structure is not a regular crystal lattice, but is disordered.
An orderly, solid array is a crystal, and a disordered array is
known as a glass.
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