A compound made of oppositely charged ions is called an ionic compound.

Here's a breakdown:

* Ions: Atoms that have gained or lost electrons, resulting in a net positive or negative charge.

* Oppositely Charged: One type of ion will have a positive charge (cation) and the other a negative charge (anion).

* Ionic Bond: The electrostatic attraction between these oppositely charged ions holds them together in a strong, rigid structure.

Examples of ionic compounds:

* Sodium chloride (NaCl): Sodium (Na+) and chloride (Cl-) ions

* Calcium oxide (CaO): Calcium (Ca2+) and oxide (O2-) ions

* Magnesium sulfate (MgSO4): Magnesium (Mg2+) and sulfate (SO42-) ions

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