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| a salt of hydrofluoric acid consisting of fluorine, as sodium fluoride, NaF, or a compound containing fluorine, as methyl fluoride, CH3F |
| any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals |
| activated carbon | |
| —n | |
| activated charcoal, Also called: active carbon a porous highly adsorptive form of carbon used to remove colour or impurities from liquids and gases, in the separation and extraction of chemical compounds, and in the recovery of solvents | |