Difference between revisions of "Hydrogen"

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(Created page with '{{Infobox element |name = hydrogen |symbol = H |left = – |right = helium |above = – |below = Li |atomic-number = 1 |atomic-weight = 1.007 94(7) |configurati…')
 
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|melting-point = 13.957 K (−259.193 °C)
 
|melting-point = 13.957 K (−259.193 °C)
 
|boiling-point = 20.39 K (−252.76 °C)
 
|boiling-point = 20.39 K (−252.76 °C)
|critical point = 33.18 K, 13.00(1) bar
+
|critical-point = 33.18 K, 13.00(1) bar
 
|solubility =  
 
|solubility =  
 
|IE-ref = <ref>{{RubberBible62nd|page=E-65}}.</ref>
 
|IE-ref = <ref>{{RubberBible62nd|page=E-65}}.</ref>
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|entropy = 130.680(3) J K<sup>−1</sup> mol<sup>−1</sup>
 
|entropy = 130.680(3) J K<sup>−1</sup> mol<sup>−1</sup>
 
|enthalpy-vaporization = 0.904 kJ mol<sup>−1</sup>
 
|enthalpy-vaporization = 0.904 kJ mol<sup>−1</sup>
 +
|enthalpy-atomization = 217.998(6) kJ mol<sup>−1</sup>
 +
|entropy-atomization = 114.717(2) J K<sup>−1</sup> mol<sup>−1</sup>
 
|CAS-number = 1333-74-0
 
|CAS-number = 1333-74-0
 
|EC-number = 215-605-7
 
|EC-number = 215-605-7

Revision as of 08:07, 20 June 2010

– ← hydrogenhelium


H

Li
Atomic properties
Atomic number 1
Standard atomic weight 1.007 94(7)
Electron configuration 1s1
Physical properties[1][2]
Melting point 13.957 K (−259.193 °C)
Boiling point 20.39 K (−252.76 °C)
Critical point 33.18 K, 13.00(1) bar
Ionization energy[3]
13.598 eV
2178.6 kJ mol−1
Thermodynamic properties[2][4]
Standard entropy 130.680(3) J K−1 mol−1
Enthalpy change of atomization 217.998(6) kJ mol−1
Entropy change of atomization 114.717(2) J K−1 mol−1
Enthalpy change of vaporization 0.904 kJ mol−1
Miscellaneous
CAS number 1333-74-0
EC number 215-605-7
Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).

Hydrogen (symbol: H) is a chemical element, the most abundant element in the universe.

References

  1. Hydrogen. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/H2/h1H>. (accessed 20 June 2010).
  2. 2.0 2.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 38–74. ISBN 0-08-022057-6.
  3. CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p E-65. ISBN 0-8493-0462-8.
  4. 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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