Difference between revisions of "Oxygen"
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|atomic-weight = 15.9994(3) | |atomic-weight = 15.9994(3) | ||
|configuration = [He] 2s<sup>2</sup> 2p<sup>4</sup> | |configuration = [He] 2s<sup>2</sup> 2p<sup>4</sup> | ||
| + | |phys-ref =  (O<sub>2</sub>)<ref name="NIST-O2">{{NIST chemistry | name = Oxygen | id = 1S/O2/c1-2 | accessdate = 2010-03-15}}.</ref> | ||
|melting-point = 54.8(2) K (−218.8 °C) | |melting-point = 54.8(2) K (−218.8 °C) | ||
|boiling-point = 90.2(2) K (−183.0 °C) | |boiling-point = 90.2(2) K (−183.0 °C) | ||
|critical-point = 154.58 K, 50.43 bar | |critical-point = 154.58 K, 50.43 bar | ||
|electronegativity = 3.44 (Pauling) | |electronegativity = 3.44 (Pauling) | ||
| + | |IE-ref = <ref name="NIST-Oat">{{NIST chemistry | name = Oxygen, atomic | id = 1S/O | accessdate = 2010-03-15}}.</ref> | ||
|IE1 = 13.61806 eV<br/>1313.5 kJ/mol | |IE1 = 13.61806 eV<br/>1313.5 kJ/mol | ||
|IE2 = 3388.3 kJ/mol | |IE2 = 3388.3 kJ/mol | ||
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|covalent-radius = 66 pm | |covalent-radius = 66 pm | ||
|vdw-radius = 152 pm | |vdw-radius = 152 pm | ||
| − | |thermo-ref =  (O<sub>2</sub>)<ref | + | |thermo-ref =  (O<sub>2</sub>)<ref name="NIST-O2"/> |
|entropy = 205.152(5) J K<sup>−1</sup> mol<sup>−1</sup> | |entropy = 205.152(5) J K<sup>−1</sup> mol<sup>−1</sup> | ||
|enthalpy-fusion = 0.444 kJ/mol | |enthalpy-fusion = 0.444 kJ/mol | ||
|enthalpy-vaporization = 6.82 kJ/mol | |enthalpy-vaporization = 6.82 kJ/mol | ||
|heat-capacity = 29.378 J K<sup>−1</sup> mol<sup>−1</sup> | |heat-capacity = 29.378 J K<sup>−1</sup> mol<sup>−1</sup> | ||
| − | |CAS-number = 7782-44-7 (O<sub>2</sub>) | + | |CAS-number = 7782-44-7 (O<sub>2</sub>)<br/>17778-80-2 (atomic) |
|EC-number = 231-956-9 | |EC-number = 231-956-9 | ||
}} | }} | ||
Revision as of 05:20, 15 March 2010
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Oxygen (ˈɒksɨdʒɨn) is a colourless gas which makes up about one fifth of the Earth's atmosphere. Its name comes from the Greek ὀξύς (oxys; acid, literally "sharp", from the taste of acids) and -γενής (-genēs; producer, literally "begetter").
References
- ↑ 1.0 1.1 Oxygen. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/O2/c1-2>. (accessed 15 March 2010).
- ↑ Oxygen, atomic. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/O>. (accessed 15 March 2010).
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