* Magnesium II (Mg²⁺): Magnesium has a +2 charge when it forms an ion (Mg²⁺).
* Chloride (Cl⁻): Chlorine has a -1 charge when it forms an ion (Cl⁻).
To create a neutral compound, we need two chloride ions (2 x -1 = -2) to balance the +2 charge of the magnesium ion.
