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Allotropes | O2, O3 (ozone) and more (see Allotropes of oxygen) |
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Appearance | colorless gas; pale blue liquid |
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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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Phase at STP | gas |
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Melting point | 54.36 K (−218.79 °C, −361.82 °F) |
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Boiling point | 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) |
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61 |
73 |
90 |
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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 |
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Natural occurrence | primordial |
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Crystal structure | cubic |
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Thermal conductivity | 26.58×10−3 W/(m⋅K) |
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Magnetic ordering | paramagnetic |
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Speed of sound | 330 m/s (gas, at 27 °C) |
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CAS Number | 7782-44-7 |
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Category: Oxygen | references |