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Polyatomic ions are atoms held together by covalent bonds as a group and that from CHM 1220 at Wayne State University
Polyatomic ions: Polyatomic ions are electrically charges collections of two or more atoms. Typically in beginning classes people are not expected to predict polyatomic ion formulas. Polyatomic ions usually have a charge because the collection of atoms has either gained an extra electron or else it has lost an electron.Most of the common inorganic polyatomic ions have negative charges.This means the ion has more electrons than the neutral atoms that are in the ion.A polyatomic ion like phosphate, PO43- has three extra electrons beyond the electrons on the P and O atoms.ost of the common inorganic polyatomic ions have negative charges. This means the ion has more electrons than the neutral atoms that are in the ion. A polyatomic ion like phosphate, PO43- has three extra electrons beyond the electrons on the P and O atoms.