Here's why:

* Ionic Compounds: MgCl₂ is formed by the electrostatic attraction between positively charged magnesium ions (Mg²⁺) and negatively charged chloride ions (Cl⁻). This strong electrostatic interaction is characteristic of ionic bonds.

* Crystalline Structure: Ionic compounds typically arrange themselves in a highly ordered, repeating three-dimensional structure known as a crystal lattice.

* Other Characteristics: Ionic crystals often have high melting and boiling points due to the strong electrostatic forces holding the ions together. They are also good conductors of electricity when dissolved in water or melted, as the ions are free to move.