halogen
noun/ˈhæl.ə.d͡ʒən/ · /ˈheɪ.lə.d͡ʒən/
Etymology From Ancient Greek ἅλς (háls, “salt" or "sea”) + γεν- (gen-), "to produce" (coined by Berzelius in 1842). By surface analysis, halo- (“salt”) + -gen (“forming”).
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Chemistry, Natural sciences, Physical sciences Any element of group 17, i.e. fluorine, chlorine, bromine, iodine, astatine and tennessine.
- Plant 12 also stored super sacks of bromochloro-5,5-dimethylimidazolidine-2,4-dione (BCDMH), which is a granular solid oxidizer with a halogen odor that, in addition to chlorine gas and hydrogen chloride, can also release bromine gas and hydrogen bromide upon decomposition.2024 November 23, “Chemical Decomposition, Fire, and Toxic Gas Release at Bio-Lab, Inc.”, in U.S. Chemical Safety and Hazard Investigation Board^(https://web.archive.org/web/20250301020605/https://www.csb.gov/assets/1/6/investigation_update_bio-lab_final_nov2024_(005).pdf), archived from the original on 01 Mar 2025, page 2:
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A light fixture in which the filament is surrounded by an atmosphere of a halogen gas.