Question

what is a pure substance made of positive and negative ions in a fixed ratio called? (1 point)
an atom
an ionic compound
a polar molecule
a hydrogen bond

Explanation:

• An atom is the basic unit of matter, not made of ions.
• A polar molecule has a partial positive and negative charge due to electronegativity differences, not composed of ions in a fixed ratio.
• A hydrogen bond is an intermolecular force, not a substance made of ions.
• An ionic compound is formed from positive (cations) and negative (anions) ions in a fixed ratio (determined by charge balance), matching the description.

Answer:

an ionic compound