Template:Infobox oxygen

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8 nitrogenoxygenfluorine
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O

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Oxygen in the periodic table of the elements
General
Name, symbol, number oxygen, O, 8
Element category nonmetals, chalcogens
Group, period, block 162, p
Appearance

Liquid Oxygen
Standard atomic weight 15.9994(3)g·mol−1
Electron configuration 1s2 2s2 2p4
Electrons per shell 2, 6
Physical properties
Phase gas
Melting point 54.36 K
(-218.79 °C, -361.82 °F)
Boiling point 90.20 K
(-182.95 °C, -297.31 °F)
Critical point 154.59 K, 5.043 MPa
Heat of fusion (O2) 0.444 kJ·mol−1
Heat of vaporization (O2) 6.82 kJ·mol−1
Specific heat capacity (25 °C) (O2)
29.378 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K       61 73 90
Atomic properties
Crystal structure cubic
Oxidation states 2, 1, −1, −2
(neutral oxide)
Electronegativity 3.44 (Pauling scale)
Ionization energies
(more)
1st: 1313.9 kJ·mol−1
2nd: 3388.3 kJ·mol−1
3rd: 5300.5 kJ·mol−1
Atomic radius 60 pm
Atomic radius (calc.) 48 pm
Covalent radius 73 pm
Van der Waals radius 152 pm
Miscellaneous
Magnetic ordering paramagnetic
Thermal conductivity (300 K) 26.58x10-3  W·m−1·K−1
Speed of sound (gas, 27 °C) 330 m/s
CAS registry number 7782-44-7
Selected isotopes
Main article: Isotopes of oxygen
iso NA half-life DM DE (MeV) DP
16O 99.76% 16O is stable with 8 neutrons
17O 0.039% 17O is stable with 9 neutrons
18O 0.201% 18O is stable with 10 neutrons
References
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