Yes. Mg2+ is a monatomic ion, but SO42- is a polyatomic ion composed of two elements, sulfur and oxygen.
Except chloride, all others are polyatomic ions.
hydrogen carbonate (aka bicarbonate) is the polyatomic ion you're looking for. Mg(HCO3)2 Mg2+ (HCO3)-
Mg2+ and SO42- (sulfate)
covalent
A monoatomic ion has only one atom examples are chloride, Cl-, fluoride, F-, sodium Na+ A polyatomic ion has more than one, e.g sulfate SO42-, nitrate, NO3-, mercurous, Hg22+ Poly is from the Greek and means "many"
Polyatomic ions ending in -ate in common form contain oxygen.
Oxygen
Ionic compounds ammonium sulfate, has both a polyatomic cation NH4+ and polyatomic anion, SO42-
These are called polyatomic ions.
polyatomic
In most of the cases it is true but SCN- , Transition metals complex ions and some organic poly atomic ions do not contain oxygen.
SO4
Ions made up of more than one atom are called polyatomic ions.
Salts are ionic. If they contain polyatomic ions,(e.g. NH4+ , SO42-.) There are covalent bonds inside these ions.
The ammonium ion, NH4+, and the nitrate ion, NO3-.
Cations are positive ions (Fe2+, NH4+).Anions are negative ions (Cl-, (SO4)2-).Fe2+ is a monoatomic ion and (NH4)+ is a polyatomic Ion (contain more than one element).
No. Most polyatomic ions are anions.