Question

ionic compounds form
crystal structures.
molecular structures.
pure elements.
neutral elements.

Explanation:

Ionic compounds consist of ions held together by electrostatic forces. These ions arrange themselves in a regular, repeating pattern to form a crystal lattice structure. Molecular structures are characteristic of covalent compounds where atoms share electrons to form molecules. Pure elements are substances that contain only one type of atom. Neutral elements is not a relevant term in the context of ionic compound structures.

Answer:

crystal structures.