* Ionic Compounds: Formed by the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions).

* Disodium Phosphate:

* Sodium (Na) is a metal, and metals tend to lose electrons, forming positive ions (Na⁺).

* The phosphate group (PO₄³⁻) is a polyatomic ion with a negative charge.

Therefore, disodium phosphate is composed of ions, making it an ionic compound.