Anion names homopolyatomic anions

The names of anions similarly are obtained by an extension of the names used for electronegative constituents, but with the proviso that the ending is always characteristic of an anion (ide, -ate or -ite, as discussed above). For the names of monoatomic anions, see Table 4.1. Homopolyatomic anions take names of the kind exemplified below. 

Monoatomic [and homopolyatomic) anions are named by replacing the termination of the element name by ide (and adding a numerical prefix as needed). In many cases, contractions or variations are employed, as exemplified below. 

The names of anions usually end in -ide if there are monatomic or homopolyatomic, or -ate for heteropolyatomic anions and coordination compounds. Anionic ligands usually end in -o. Thus CP is chloride, I3 is triiodide and S042 is sulfate but become, chloro, triiodo and sulfato if they are coordinated as ligands. The names of complex anions are not always derived from the familiar name... 

IR-5.2 Stoichiometric names of elements and binary compounds IR-5.3 Names of ions and radicals IR-5.3.1 General IR-5.3.2 Cations IR-5.3.2.1 General IR-5.3.2.2 Monoatomic cations IR-5.3.2.3 Homopolyatomic cations IR-5.3.2.4 Heteropolyatomic cations IR-5.3.3 Anions IR-5.3.3.1 Overview IR-5.3.3.2 Monoatomic anions IR-5.3.3.3 Homopolyatomic anions IR-5.3.3.4 Heteropolyatomic anions IR-5.4 Generalized stoichiometric names... 

The endings in anion names are ide (monoatomic or homopolyatomic species, heteropolyatomic species named from a parent hydride), ate (heteropolyatomic species named additively), and ite (used in a few names which are still acceptable but do not derive from current systematic nomenclature). When there is no ambiguity, the charge number may be omitted, as in Example 1 below. Parent hydride-based names do not carry charge numbers because the name itself implies the charge (Examples 3 and 4 below). 

Homopolyatomic anions are named by adding the charge number to the stoichiometric name of the corresponding neutral species, i.e. the element name with the appropriate multiplicative prefix. Again, a radical dot may be added as appropriate. 

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