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 = &#32;(O<sub>2</sub>)<ref name="NIST-O2">{{NIST chemistry | name = Oxygen | id = 1S/O2/c1-2 | accessdate = 2010-03-15}}.</ref>
+
|phys-ref = &#32;(O<sub>2</sub>)<ref name="NIST-O2">{{NIST chemistry | name = Oxygen | id = 1S/O2/c1-2 | accessdate = 2010-03-15}}.</ref><ref>{{citation | contribution = Oxygen | url = http://encyclopedia.airliquide.com/encyclopedia.asp?GasID=48 | title = Gas Encyclopedia | publisher = Air Liquide | accessdate = 2010-04-03}}.</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
 +
|triple-point = 54.35 K, 1.52 mbar
 +
|density = 1.354 kg m<sup>−3</sup> (1 atm, 15 °C)<br/>4.475 kg m<sup>−3</sup> (1 atm, 90.2 K)<br/>1.141 g cm<sup>−3</sup> (l, 90.2 K)
 
|chem-ref = <ref>{{citation | first = A. L. | last = Allred | title = Electronegativity values from thermochemical data | journal = J. Inorg. Nucl. Chem. | year = 1961 | volume = 17 | issue = 3–4 | page = 215–21 | doi = 10.1016/0022-1902(61)80142-5}}.</ref>
 
|chem-ref = <ref>{{citation | first = A. L. | last = Allred | title = Electronegativity values from thermochemical data | journal = J. Inorg. Nucl. Chem. | year = 1961 | volume = 17 | issue = 3–4 | page = 215–21 | doi = 10.1016/0022-1902(61)80142-5}}.</ref>
 
|electronegativity = 3.44 (Pauling)
 
|electronegativity = 3.44 (Pauling)
 +
|solubility = 48.9 cm<sup>3</sup> dm<sup>−3</sup> (1 atm, 0 °C)
 
|IE-ref = <ref name="NIST-Oat">{{NIST chemistry | name = Oxygen, atomic | id = 1S/O | accessdate = 2010-03-15}}.</ref><ref>{{CODATA 2002}}.</ref>
 
|IE-ref = <ref name="NIST-Oat">{{NIST chemistry | name = Oxygen, atomic | id = 1S/O | accessdate = 2010-03-15}}.</ref><ref>{{CODATA 2002}}.</ref>
 
|IE1 = 13.618 06 eV,<br/>1313.943 kJ mol<sup>−1</sup>
 
|IE1 = 13.618 06 eV,<br/>1313.943 kJ mol<sup>−1</sup>

Revision as of 08:53, 3 April 2010

nitrogenoxygenfluorine


O

S
Atomic properties
Atomic number 8
Standard atomic weight 15.9994(3)
Electron configuration [He] 2s2 2p4
Physical properties (O2)[1][2]
Melting point 54.8(2) K (−218.8 °C)
Boiling point 90.2(2) K (−183.0 °C)
Triple point 54.35 K, 1.52 mbar
Critical point 154.58 K, 50.43 bar
Density 1.354 kg m−3 (1 atm, 15 °C)
4.475 kg m−3 (1 atm, 90.2 K)
1.141 g cm−3 (l, 90.2 K)
Chemical properties[3]
Electronegativity 3.44 (Pauling)
Solubility in water 48.9 cm3 dm−3 (1 atm, 0 °C)
Ionization energies[4][5]
1st 13.618 06 eV,
1313.943 kJ mol−1
2nd 35.1211 eV,
3388.67 kJ mol−1
3rd 54.9355 eV,
5300.47 kJ mol−1
4th 77.4135 eV,
7469.27 kJ mol−1
5th 113.8989 eV,
10 989.57 kJ mol−1
6th 138.1196 eV,
13 326.52 kJ mol−1
7th 739.3268 eV,
71 334.20 kJ mol−1
8th 871.4097 eV,
84 078.26 kJ mol−1
Total 2043.8432 eV,
197 200.9 kJ mol−1
Electron affinity[4]
140.9759(42) kJ mol−1
Atomic radii
Covalent radius 66 pm
Van der Waals radius 152 pm
Thermodynamic properties (O2)[1][6]
Standard entropy 205.152(5) J K−1 mol−1
Enthalpy change of atomization 249.18(10) kJ mol−1
Entropy change of atomization −44.093(6) J K−1 mol−1
Enthalpy change of fusion 0.444 kJ mol−1
Enthalpy change of vaporization 6.82 kJ mol−1
Molar heat capacity (Cp) 29.378 J K−1 mol−1
Miscellaneous
CAS number 7782-44-7 (O2)
17778-80-2 (atomic)
EC number 231-956-9
Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).

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. 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).
  2. Oxygen. In Gas Encyclopedia; Air Liquide, <http://encyclopedia.airliquide.com/encyclopedia.asp?GasID=48>. (accessed 3 April 2010).
  3. Allred, A. L. Electronegativity values from thermochemical data. J. Inorg. Nucl. Chem. 1961, 17 (3–4), 215–21. DOI: 10.1016/0022-1902(61)80142-5.
  4. 4.0 4.1 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).
  5. Mohr, Peter J.; Taylor, Barry N. CODATA recommended values of the fundamental physical constants: 2002. Rev. Mod. Phys. 2005, 77 (1), 1–107. DOI: 10.1103/RevModPhys.77.1.
  6. Cox, J. D.; Wagman, D. D.; Medvedev, V. A. CODATA Key Values for Thermodynamics; Hemisphere: New York, 1989. ISBN 0891167587, <http://www.codata.org/resources/databases/key1.html>.

External links

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