Calcium fluoride, a white crystalline solid compound made up of calcium cations (Ca²⁺) and fluoride anions (F⁻).
Calcium Ion (Ca²⁺): A positively charged ion formed when calcium atoms lose two electrons.
Fluoride Ion (F⁻): A negatively charged ion formed when fluorine atoms gain one electron.
Ionic Compound: A compound composed of positive and negative ions held together by electrostatic forces.