Difference between revisions of "Oxygen"

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Line 8: Line 8:
 
|atomic-number = 8
 
|atomic-number = 8
 
|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>
 
|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
 +
|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)
 
|IE-ref = <ref name="NIST-Oat">{{NIST chemistry | name = Oxygen, atomic | id = 1S/O | accessdate = 2010-03-15}}.</ref>
 
|IE-ref = <ref name="NIST-Oat">{{NIST chemistry | name = Oxygen, atomic | id = 1S/O | accessdate = 2010-03-15}}.</ref>
Line 24: Line 25:
 
|IE8 = 871.4097 eV
 
|IE8 = 871.4097 eV
 
|IE-total = 2043.8432 eV
 
|IE-total = 2043.8432 eV
 +
|EA-ref = <ref name="NIST-Oat"/>
 
|EA1 = 140.9759(42) kJ mol<sup>−1</sup>
 
|EA1 = 140.9759(42) kJ mol<sup>−1</sup>
 +
|radius-ref =
 
|covalent-radius = 66 pm
 
|covalent-radius = 66 pm
 
|vdw-radius = 152 pm
 
|vdw-radius = 152 pm
Line 31: Line 34:
 
|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 =
 
|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 =
 
|CAS-number = 7782-44-7 (O<sub>2</sub>)<br/>17778-80-2 (atomic)
 
|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 12:50, 15 March 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]
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
5th 113.8989 eV
6th 138.1196 eV
7th 739.3268 eV
8th 871.4097 eV
Total 2043.8432 eV
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]
Standard entropy 205.152(5) 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).

External links

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