Oxide
Molecular oxides

Although most metal oxides are crystalline solids, many non-metal oxides are molecules. Examples of molecular oxides are carbon dioxide and carbon monoxide. All simple oxides of nitrogen are molecular, e.g., NO, N O, NO and N O. Phosphorus pentoxide is a more complex molecular oxide with a deceptive name, the real formula being P O. Tetroxides are rare, with a few more common examples being ruthenium tetroxide, osmium tetroxide, and xenon tetroxide.
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