Tetrahalomethanes are on the border of inorganic and organic chemistry, thus they can be assigned both inorganic and organic names by IUPAC: tetrafluoromethane - carbon tetrafluoride, tetraiodomethane - carbon tetraiodide, dichlorodifluoromethane - carbon dichloride difluoride.
Each halogen (F, Cl, Br, I) forms corresponding halomethane, but their stability decreases in order CF4 > CH4 > CCl4 > CBr4 > CI4 from exceptionally stable gaseous tetrafluoromethane with bond energy 515 kJ.mol−1 to solid tetraiodomethane. It depends on bond energy.
Many mixed halomethanes are also known, such as CBrClF2.
Fluorine and chlorine, sometimes bromine-substituted halomethanes are used as refrigerants.