The reaction between calcium metal (Ca) and chlorine gas (Cl₂) is a classic example of a synthesis reaction, where two elements combine to form a compound. The product of this reaction is calcium chloride (CaCl₂):

Ca(s) + Cl₂(g) → CaCl₂(s)

Here's a breakdown:

* Calcium (Ca) is a reactive metal in group 2 of the periodic table.

* Chlorine (Cl₂) is a diatomic gas and a highly reactive nonmetal.

* Calcium chloride (CaCl₂) is an ionic compound commonly used as a de-icer and in other applications.

This reaction is exothermic, meaning it releases heat. The reaction can be quite vigorous, especially if the calcium metal is finely divided.