How to say atomic number 9 ?

Atomic number 9

[əˈtɑmɪk ˈnʌmbər 9]

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What is the definition of atomic number 9 ?

  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
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