Difference between revisions of "Oxygen"

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|covalent-radius = 66 pm
 
|covalent-radius = 66 pm
 
|vdw-radius = 152 pm
 
|vdw-radius = 152 pm
|thermo-ref = &#32;(O<sub>2</sub>)<ref name="NIST-O2"/>
+
|thermo-ref = &#32;(O<sub>2</sub>)<ref name="NIST-O2"/><ref>{{CODATA thermo}}.</ref>
 
|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<sup>−1</sup>
 
|enthalpy-fusion = 0.444 kJ mol<sup>−1</sup>
 
|enthalpy-vaporization = 6.82 kJ mol<sup>−1</sup>
 
|enthalpy-vaporization = 6.82 kJ mol<sup>−1</sup>
|enthalpy-atomization =  
+
|enthalpy-atomization = 249.18(10) kJ mol<sup>−1</sup>
 +
|entropy-atomization = −44.093(6) J K<sup>−1</sup> mol<sup>−1</sup>
 
|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>
 
|misc-ref =  
 
|misc-ref =  

Revision as of 08:34, 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]
Melting point 54.8(2) K (−218.8 °C)
Boiling point 90.2(2) K (−183.0 °C)
Critical point 154.58 K, 50.43 bar
Chemical properties[2]
Electronegativity 3.44 (Pauling)
Ionization energies[3][4]
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[3]
140.9759(42) kJ mol−1
Atomic radii
Covalent radius 66 pm
Van der Waals radius 152 pm
Thermodynamic properties (O2)[1][5]
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. 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.
  3. 3.0 3.1 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).
  4. 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.
  5. 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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