* Calcium (Ca) has a +2 charge when it forms an ion (Ca²⁺).

* Fluorine (F) has a -1 charge when it forms an ion (F⁻).

In calcium fluoride, there is one calcium ion (Ca²⁺) and two fluoride ions (2F⁻). The positive and negative charges balance out:

+2 (from Ca²⁺) + 2(-1) (from 2F⁻) = 0

Therefore, the net charge of the compound is zero.