When naming the compound containing calcium and chlorine, you change the suffix of the nonmetal (chlorine) to -ide.

Here's why:

* Calcium is a metal, and its name remains unchanged in the compound name.

* Chlorine is a nonmetal. When forming a binary ionic compound (two elements), we change the ending of the nonmetal's name to "-ide".

Therefore, the name of the compound containing calcium and chlorine is calcium chloride.