Hydrogen

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– ← hydrogen → helium
–
↑
H
↓
Li
Atomic properties
Atomic number 1
Standard atomic weight 1.007 94(7)
Electron configuration 1s1
Physical properties (H2)[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]
13.598 432 44(36) eV
1305.584 631(12) kJ mol−1
Thermodynamic properties (H2)[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
Hazards[5]
GHS pictograms Flam. Gas 1Press. Gas
GHS signal word DANGER
GHS hazard statements H220
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).
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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. ↑ Moore, Charlotte E. Ionization potentials and ionization limits derived from the analyses of optical spectra. Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.) 1970, 34, 1–22, <http://www.nist.gov/data/nsrds/NSRDS-NBS34.pdf>.
  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>.
  5. ↑ Index no. 001-001-00-9 of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 340.

External links

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