Final answer:
Halogens are reactive elements in Group 17 that form salts with metals and have diverse applications.
Explanation:
Halogens are the elements in Group 17 of the periodic table, including fluorine, chlorine, bromine, iodine, and astatine.
The term halogen originates from the Greek words for "salt forming," as these elements readily react with metals to create salts like sodium chloride.
Halogens are widely used in various applications, such as disinfectants, water treatment, and in organic synthesis.
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