| 单词 | atomic number 9 |
| 释义 | atomic number 9 (extremely rare) n WORD FAMILY atomic number 9 n a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite Syn|Hyper F, fluorine chemical element, element any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter gasa fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely halogenany of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions |
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