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Oxygen, 8O Liquid oxygen boiling |
Oxygen |
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Allotropes | O2, O3 (ozone) |
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Appearance | gas: colorless liquid and solid: pale blue |
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Standard atomic weight Ar, std(O) | [[[:Template:Val]], Template:Val] conventional: Template:Val |
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Oxygen in the periodic table |
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Atomic number (Z) | 8 |
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Group | group 16 (chalcogens) |
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Period | period 2 |
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Block | p-block |
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Electron configuration | [He] 2s2 2p4 |
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Electrons per shell | 2, 6 |
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Physical properties |
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Phase at STP | gas |
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Melting point | (O2) 54.36 K (−218.79 °C, −361.82 °F) |
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Boiling point | (O2) 90.188 K (−182.962 °C, −297.332 °F) |
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Density (at STP) | 1.429 g/L |
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when liquid (at b.p.) | 1.141 g/cm3 |
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Triple point | 54.361 K, 0.1463 kPa |
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Critical point | 154.581 K, 5.043 MPa |
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Heat of fusion | (O2) 0.444 kJ/mol |
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Heat of vaporization | (O2) 6.82 kJ/mol |
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Molar heat capacity | (O2) 29.378 J/(mol·K) |
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Vapor pressure
P (Pa)
|
1
|
10
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100
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1 k
|
10 k
|
100 k
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at T (K)
|
|
|
|
61
|
73
|
90
|
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Atomic properties |
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Oxidation states | −2, −1, 0, +1, +2 |
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Electronegativity | Pauling scale: 3.44 |
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Ionization energies | - 1st: 1313.9 kJ/mol
- 2nd: 3388.3 kJ/mol
- 3rd: 5300.5 kJ/mol
- (more)
|
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Covalent radius | 66±2 pm |
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Van der Waals radius | 152 pm |
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Spectral lines of oxygen |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | cubic |
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Speed of sound | 330 m/s (gas, at 27 °C) |
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Thermal conductivity | 26.58×10−3 W/(m·K) |
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Magnetic ordering | paramagnetic |
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Magnetic susceptibility | +3449.0·10−6 cm3/mol (293 K)[1] |
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CAS Number | 7782-44-7 |
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History |
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Discovery | Carl Wilhelm Scheele (1771) |
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Named by | Antoine Lavoisier (1777) |
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Main isotopes of oxygen |
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Category: Oxygen | references |
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References
These references will appear in the article, but this list appears only on this page.
- ↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
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