What is the chemical formula for magnesium chloride?

Magnesium chloride is represented by the chemical formula MgCl2. This reflects its composition of one magnesium (Mg) atom bonded to two chloride (Cl) atoms. Magnesium has a valency of +2, meaning it tends to lose two electrons, resulting in a 2+ charge. Each chloride ion has a charge of -1. To balance the overall charge, two chloride ions are needed to pair with one magnesium ion, thus forming MgCl2.

This understanding of ionic compounds is crucial in chemistry, as it illustrates how elements combine based on their charges to achieve electrical neutrality in a compound. The correct representation of the compound's formula is essential in both practical applications and in laboratory settings. In contrast, the other options either depict incorrect formulas for magnesium chloride or relate to different compounds entirely.