When ionic oxides are dissolved in water, the O 2− ions react with water molecules to form hydroxide ions (OH −), and a basic solution results. Ionic oxides contain O 2− (oxide) ions and metal cations, whereas molecular oxides contain molecules in which oxygen (O) is covalently bonded to other nonmetals such as sulfur (S) or nitrogen (N). Oxides, for example, can be either ionic or molecular. Inorganic compounds are most often classified in terms of the elements or groups of elements that they contain.

Inorganic compounds include compounds that are made up of two or more elements other than carbon, as well as certain carbon-containing compounds that lack carbon-carbon bonds, such as cyanides and carbonates. Structure of the three-centre, two-electron bond in a B―H―B fragment of a diborane molecule

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