Here's why:

* MgCrO4 is the chemical formula for magnesium chromate.

* Magnesium chromate is an ionic compound, meaning it's formed by the electrostatic attraction between positively charged magnesium ions (Mg²⁺) and negatively charged chromate ions (CrO₄²⁻).

* Ionic compounds generally have strong electrostatic forces holding them together, resulting in a rigid, crystalline structure, which is characteristic of solids.

Let me know if you have any other questions!