atomic number 9

Noun
  1. 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 (synset 114661685)
    is a type of:
    • 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
    • gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
    • halogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
    substance meronym:
    • cryolite, greenland spar - a white mineral consisting of fluorides of aluminum and sodium; a source of fluorine
    • fluorapatite - a form of apatite in which fluorine predominates over chlorine
    • fluor, fluorite, fluorspar - a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine
    same as: f, fluorine

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