Difference between revisions of "Oxygen"

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Line 4: Line 4:
 
|left = [[nitrogen]]
 
|left = [[nitrogen]]
 
|right = [[fluorine]]
 
|right = [[fluorine]]
|above =
+
|above =
 
|below = [[sulfur|S]]
 
|below = [[sulfur|S]]
 
|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>
 
|melting-point = −218.8 °C
 
|melting-point = −218.8 °C
 
|boiling-point = −183.0 °C
 
|boiling-point = −183.0 °C
Line 16: Line 16:
 
|IE2 = 3388.3 kJ/mol
 
|IE2 = 3388.3 kJ/mol
 
|IE3 = 5300.5 kJ/mol
 
|IE3 = 5300.5 kJ/mol
|covalent-radius = 66
+
|covalent-radius = 66 pm
|vdw-radius = 152
+
|vdw-radius = 152 pm
|enthalpy-fusion=(O<sub>2</sub>) 0.444
+
|enthalpy-fusion = (O<sub>2</sub>) 0.444 kJ/mol
|enthalpy-vaporization=(O<sub>2</sub>) 6.82
+
|enthalpy-vaporization = (O<sub>2</sub>) 6.82 kJ/mol
|heat-capacity=(O<sub>2</sub>)<br />29.378
+
|heat-capacity = (O<sub>2</sub>) 29.378 J K<sup>−1</sup> mol<sup>−1</sup>
 
|CAS-number = 7782-44-7
 
|CAS-number = 7782-44-7
 
|EC-number = 231-956-9
 
|EC-number = 231-956-9

Revision as of 21:26, 14 March 2010

nitrogenoxygenfluorine


O

S
Atomic properties
Atomic number 8
Standard atomic weight 15.9994(3)
Electron configuration [He] 2s2 2p4
Physical properties
Melting point −218.8 °C
Boiling point −183.0 °C
Critical point 154.59 K, 5.043 MPa
Chemical properties
Electronegativity 3.44 (Pauling)
Ionization energies
1st 1313.5 kJ/mol
2nd 3388.3 kJ/mol
3rd 5300.5 kJ/mol
Atomic radii
Covalent radius 66 pm
Van der Waals radius 152 pm
Thermodynamic properties
Enthalpy change of fusion (O2) 0.444 kJ/mol
Enthalpy change of vaporization (O2) 6.82 kJ/mol
Molar heat capacity (Cp) (O2) 29.378 J K−1 mol−1
Miscellaneous
CAS number 7782-44-7
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").

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