How many elements are in CaCl2?

2 elements (calcium and chlorine)

Explanation:

We are given the compound CaCl₂

We are supposed to determine the number of elements in the compound.

First we need to know that a compound is made up of several atoms from different elements. In this case, calcium chloride is an ionic compound that is made up of calcium atom and two chlorine atoms. Thus, we would say that calcium chloride is made up of two elements, that is, calcium and chlorine.