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Atomic symbol - O
Atomic weight - 15.9994
Atomic number - 8
Electron configuration - 2-6
Oxidation states - -2
State of matter - gas
Discovered in 1774 by Joseph Priestly
Boils at -183 .C, melts at -218.4 .C

Oxygen is commercially prepared by the fractional distillation of liquid air.
At high temperatures oxygen combines with most elements and many compounds,
esspecially those containing carbon and hydrogen, to form oxides of all
elements. Oxygen is necessary to sustain human life. A substance combining
with oxygen is always oxidized, and all such combinations produce heat energy.

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