Question

which of the following could form an ionic compound? check all that apply.
o²⁻ and s²⁻
cl⁻ and k⁺
ca²⁺ and fe³⁺
na⁺ and f⁻

Explanation:

Ionic compounds are formed between a cation (positively - charged ion) and an anion (negatively - charged ion).

• \(O^{2 -}\) and \(S^{2 -}\) are both anions. Two anions cannot form an ionic compound.
• \(Cl^{-}\) is an anion and \(K^{+}\) is a cation. They can form the ionic compound \(KCl\).
• \(Ca^{2 +}\) is a cation and \(Fe^{3+}\) is a cation. Two cations cannot form an ionic compound.
• \(Na^{+}\) is a cation and \(F^{-}\) is an anion. They can form the ionic compound \(NaF\).

Answer:

\(Cl^{-}\) and \(K^{+}\), \(Na^{+}\) and \(F^{-}\)