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Oxygen, 8O Liquid oxygen boiling |
| Oxygen |
|---|
| 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
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
|
|
|
61
|
73
|
90
|
|
| 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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