Valency, also known as combining power, is the measure of the number of atoms of hydrogen or any other monovalent element with which an atom of the element combines, or for which it can be substituted or with which it ...
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Polyatomic ions consist of multiple atoms bonded together, whereas single-charged ions are either single atoms or simple molecules with a net charge.
A polyatomic ion is a group of atoms that carries a net electrical charge.
Sodium chloride (NaCl) is a classic example, with positively charged sodium ions (Na+) and negatively charged chloride ions (Cl–).
An anion is a negatively charged ion, while a cation is a positively charged ion.