2 Ca + 2 Cl₂ → CaCl₂ + energy

Is a combination reaction (also called a synthesis reaction).

Here's why:

* Combination reaction: Two or more reactants combine to form a single product.

* In this reaction: Calcium (Ca) and chlorine gas (Cl₂) combine to form calcium chloride (CaCl₂).

Additionally, since the reaction releases energy, it is also classified as an exothermic reaction.