Yes, CN-.
The charge on the polytomic ion cyanide is -1.
If it contains a number in its formula (such as in peroxide, O2-) it is polyatomic as this means there are more than one atom of the same type. If it contains more than one element, which you would...
They are both ions and both can form an ionic compound
it is sulfate, sulfite and many more.... Common Polyatomic Ions: -1 Charge: · Chlorate: CO3-1 · Chlorite: ClO2-1 · Cyanide: CN-1 · Dihydrogen Phosphate: H2PO4-1 · Ethanoate: CH3COO -1 ·...