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1 definition found
 for oxygen
From The Elements (07Nov00) :

  oxygen
  Symbol: O
  Atomic number: 8
  Atomic weight: 15.9994
  A colourless, odourless gaseous element belonging to group 16 of the
  periodic table. It is the most abundant element present in the earth's
  crust. It also makes up 20.8% of the Earth's atmosphere. For industrial
  purposes, it is separated from liquid air by fractional distillation. It
  is used in high temperature welding, and in breathing. It commonly comes
  in the form of Oxygen, but is found as Ozone in the upper atmosphere. It
  was discovered by Priestley in 1774.
  

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