In chemistry, the halogens (salt producers), are a group of elements comprising chlorine, bromine, iodine, and fluorine, on account of the fact that their compounds with sodium are common salt (NaCl) and allied compounds. The three first named closely resemble one another in most chemical properties, and there is a gradual falling off in chemical activity as we pass from chlorine to iodine. Fluorine is the lightest and most chemically active of the four. They are the most pronouncedly non-metallic of all the elements, as the alkali metals - sodium, potassium, lithium, etc are the most metallic.. Research Halogens
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Abbreviations
SciTech
Research Halogens
