An ion that contains more than one atom.
Compare with molecule, ion and polyatomic molecule. A polyatomic ion is a charged particle that contains more than two covalently bound atoms. See Polyatomic Ions for more.
a group of atoms bonded together covalenty but possessing an overall charge, such as SO42-.
a charged group of covalently bonded atoms
an ion An ion is an atom or group of atoms with a net electric charge
a tight group of atoms that carries a collective ionic charge and can participate as either the cation or anion in an ionic compound
an ion containing a number of atoms.
A polyatomic ion is an ion consisting of a molecule with covalently bonded atoms or of a metal complex that can be considered as acting as a single unit in the context of acid and base chemistry or in the formation of salts. The prefix poly- means many in Greek. Note, a polyatomic ion is also referred to in older works as a radical.