| 单词 | halogen |
| 释义 | Word Frequency halogen(ˈhæləˌdʒɛn) noun any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions Derived forms halogenoid (ˈhalogenˌoid) adjective halogenous (həˈlɒdʒɪnəs) adjective Word origin C19: from Swedish; see halo-, -gen |
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