Magnesium reacts with Phosphorus and produce Magnesium phosphide. The equation is:
Mg + P ---> Mg₃P₂
The balanced equation is:
3 Mg + 2 P ---> Mg₃P₂
It need to have the same amount of atoms of each element on both sides of the equation.
Answer: 3 Mg + 2 P ---> Mg₃P₂