Template:Infobox oxygen

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<tr><td>Chemical series</td><td>nonmetals, chalcogens</td></tr> <tr><td>Appearance</td><td>
Liquid Oxygen.gif

Liquid Oxygen <tr><td>Atomic radius</td><td>60 pm</td></tr><tr><td>Atomic radius (calc.)</td><td>48 pm</td></tr><tr><td>Covalent radius</td><td>73 pm</td></tr><tr><td>Van der Waals radius</td><td>152 pm</td></tr> <tr><td rowspan="1" valign="top">Magnetic ordering</td><td>paramagnetic</td></tr><tr><td>Thermal conductivity</td><td>(300 K) 26.58x10-3  W·m−1·K−1</td></tr><tr><td>Speed of sound</td><td>(gas, 27 °C) 330 m/s</td></tr><tr><td>CAS registry number</td><td>7782-44-7</td></tr>
8 nitrogenoxygenfluorine


Name, symbol, number oxygen, O, 8
Group, period, block 162, p
Standard atomic weight 15.9994(3) g·mol−1
Electron configuration 1s2 2s2 2p4
Electrons per shell 2, 6
Physical properties<tr><td>Phase</td><td>gas</td></tr><tr><td>Density</td><td>(0 °C, 101.325 kPa)
1.429 g/L</td></tr><tr><td>Melting point</td><td>54.36 K
(-218.79 °C, -361.82 °F)</td></tr><tr><td>Boiling point</td><td>90.20 K
(-182.95 °C, -297.31 °F)</td></tr><tr><td>Critical point</td><td>154.59 K, 5.043 MPa</td></tr><tr><td>Heat of fusion</td><td>(O2) 0.444 kJ·mol−1</td></tr><tr><td>Heat of vaporization</td><td>(O2) 6.82 kJ·mol−1</td></tr><tr><td>Heat capacity</td><td>(25 °C) (O2)
29.378 J·mol−1·K−1</td></tr>
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K       61 73 90
Atomic properties

<tr><td>Crystal structure</td><td>cubic</td></tr><tr><td>Oxidation states</td><td>2, 1, −1, −2
(neutral oxide)</td></tr><tr><td>Electronegativity</td><td>3.44 (Pauling scale)</td></tr>

Ionization energies
1st: 1313.9 kJ·mol−1
2nd: 3388.3 kJ·mol−1
3rd: 5300.5 kJ·mol−1
Selected isotopes
Main article: Isotopes of oxygen
iso NA half-life DM DE (MeV) DP
16O 99.76% O is stable with 8 neutrons
17O 0.039% O is stable with 9 neutrons
18O 0.201% O is stable with 10 neutrons
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