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Prefixes Used when Naming Molecular Compounds
When writing the name of a molecular compound, as when writing the formula, the first element is the more metal-like one (see Table 5.1, Order of Listing Nonmetal Elements).
The prefixes given to each element indicate the number of atoms present.
mono- 1 hexa- 6
di- 2 hepta- 7
tri- 3 octa- 8
tetra- 4 nona-9
penta- 5 deca-10