Electronic data		Thermal data		Steric data
Shells: 2,6 Orbitals: [He] 2s2 2p4 Electronegativity: 3.5, 3.5 1. Ionization potential: 13.6181 eV 2. Ionization potential: 35.117 eV 3. Ionization potential: 54.934 eV Oxidation states: -2,-1 Electrical conductivity: --		Melting point: -218.4 °C Boiling point: -182.962 °C Specific heat: 0.92 J/gK Heat of fusion: 0.22259 kJ/mol Heat of vaporization: 3.4099 kJ/mol Thermal conductivity: 0.0002674 W/cmK		Atomic radius: 0.65 Å Ionic radius: 1.40 Å () Covalent radius: 0.73 Å Atomic volume: 14.0 cm³/mol Density (293 K): 0.001429 g/cm³ Crystal structure: Cubic

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Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
15O	0	15	1/2	122.2s	+,EC	View
16O	99.759	15.9949	0	--	stable	--
17O	0.037	16.9991	5/2	--	stable	--
18O	0.204	17.9992	0	--	stable	--

Legend

Name origin:	Greek: oxys and genes, (acid former)
Description:	Colorless, odorless, tasteless gas; pale blue liquid. Third most abundant element in the universe. It is the most abundant element in the earth's crust, and makes up almost 21% of the atmosphere.
Discovered by:	Joseph Priestly, Carl Wilhelm Scheele
Year:	1774
Place:	England/Sweden
Sources:	Obtained primarily from liquid air by fractional distillation. Small amounts are made in the laboratory by electrolysis of water or heating potassium chlorate (KClO3) with manganese dioxide (MnO2) catalyst.
Use(s):	Used in steel making, welding, and supporting life. Naturally occuring ozone (O3) in the upper atmosphere shields the earth from ultraviolet radiation.