atomic number 9

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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:
fluorine, F
• Hypernyms:
chemical element, element, gas, halogen
• Substance Holonyms:
fluorite, fluorspar, fluor, fluorapatite, cryolite, Greenland spar