Data:Physical and thermochemical properties of the elements

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Element Z Ar Standard
state 		Tm/°C Tb/°C ρ
g cm−3 		So
J K−1 mol−1 		Ho298−Ho0
kJ mol−1 		ΔatHo
kJ mol−1 		ΔfusH
kJ mol−1 		ΔvapH
kJ mol−1 		Notes
Refs.
Actinium 89 [note 1] Ac (cr) 1050 3300 10.07 406 10.5 293 [1][2][note 2]
Aluminium 13 26.981 5386(8) Al (cr) 660.37 2467 2.699 28.30(10) 4.540(20) +330.0(40) 10.56 290.8 [3][4]
Americium 95 [note 1] Am (cr) 876 2067 13.671 55 14.4 230.2 [5][note 3]

Notes

  1. ↑ 1.0 1.1 This element has no stable isotopes and no characteristic terrestrial abundance: no standard atomic weight can be given.
  2. ↑ Many of the properties of actinium are only known through estimation and/or extrapolation. Several estimates of the melting point and thermodynamic properties have been made; the boiling point was estimated on the basis of vapour pressure measurements. The density was determined by X-ray crystallography.
  3. ↑ The boiling point and thermodynamic properties of americium are calculated values.

References

  1. ↑ Kirby, H. W.; Morss, L. R. Actinium. In The Chemistry of the Actinide and Transactinide Elements, 3rd ed.; Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean, Eds.; Springer: Dordrecht, the Netherlands, 2006; Vol. 1, Chapter 2, pp 18–51. doi:10.1007/1-4020-3598-5_2, <http://radchem.nevada.edu/classes/rdch710/files/actinium.pdf>.
  2. ↑ Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984. ISBN 0-08-022057-6.
  3. ↑ 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>.
  4. ↑ Aluminium. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/Al>. (accessed 27 December 2010).
  5. ↑ Runde, Wolfgang H.; Schulz, Wallace W. Americium. In The Chemistry of the Actinide and Transactinide Elements, 3rd ed.; Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean, Eds.; Springer: Dordrecht, the Netherlands, 2006; Vol. 2, Chapter 8, pp 1265–1395. doi:10.1007/1-4020-3598-5_8, <http://radchem.nevada.edu/classes/rdch710/files/actinium.pdf>.
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