inorganic chemistry - Why is CaCl2 called calcium chloride?

Doing a first year chem class.
Just read through the molecular naming of compounds and now I'm confused as to why $\ce{CaCl2}$ is called calcium chloride and not calcium dichloride?

Answer

Elements from the first 2 columns only have 1 oxidation state, so any compound they form, it is easy to determine the number of anions.