halogen

noun

any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
同族の5つの金属元素（フッ素、塩素、臭素、ヨウ素、またはアスタチン）であり、すべて一価で容易にマイナスイオンを形成する

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