What are possible components of ionic compounds? Check all that apply.

Ionic compounds form from positively charged cations and negatively charged anions. A metal can form a cation that pairs with a nonmetal anion, so A is possible; a metal cation can also pair with a polyatomic anion, so C is possible. Two metals are generally both cations, and a polyatomic cation plus a metal would also lack an anion, so B and D are not possible as stated.

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