These ions are polyatomic ions. The prefix "poly-" means "many," and the rest of the word "atomic" clearly refers to the atoms themselves. So, if there are two or more atoms in an ion, this ion is polyatomic.
Polyatomic ions are ions made up of two or more atoms that carry an overall charge. They include examples such as the ammonium ion (NH₄⁺) and sulfate ion (SO₄²⁻). Understanding these ions is essential for studying various chemical compounds and reactions.
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