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Isopolyanions derived by the condensation of molecules of the same acid and containing the central element in the oxidation state corresponding to its group number [e.g., P(V), Mo(VI), are named by indicating the number of atoms of the central element with Greek numeral prefixes.

Examples :
                    S2O72-                 disulphate                            Mo7O246-        heptamolybdate
                    P3O105-              triphosphate                        Na2B4O7          disodium tetraborate
                    Cr4O132-             tetrachromate

Cyclic and straight-chain molecular arrangement can be distinguished by means of the prefixes cyclo and catena, respectively.

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