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>
 
|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
Line 19: Line 21:
 
|covalent-radius = 66 pm
 
|covalent-radius = 66 pm
 
|vdw-radius = 152 pm
 
|vdw-radius = 152 pm
|thermo-ref = &#32;(O<sub>2</sub>)<ref>{{NIST}}</ref>
+
|thermo-ref = &#32;(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 06:20, 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
Electronegativity 3.44 (Pauling)
Ionization energies[2]
1st 13.61806 eV
1313.5 kJ/mol
2nd 3388.3 kJ/mol
3rd 5300.5 kJ/mol
Electron affinity
1.461112(44) eV
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
Enthalpy change of vaporization 6.82 kJ/mol
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, 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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