This is a classic example of a salt formed from a metal (magnesium) and a non-metal (chlorine). The reaction is exothermic, meaning it releases heat.

Here's the chemical equation:

Mg + Cl₂ → MgCl₂

This reaction is important in various applications, including:

* Production of magnesium metal: Magnesium chloride is an important source of magnesium in industrial processes.

* De-icing roads: Magnesium chloride is used to melt ice and snow on roads in winter.

* Fire retardant: Magnesium chloride is a fire retardant used in various industries.