Curium

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americiumcuriumberkelium
Gd

Cm

Atomic properties
Atomic number 96
Electron configuration [Rn] 5f8 7s2
Physical properties[1]
Melting point 1345(50) °C (1618(50) K)
Boiling point 3110 °C (3383 K)
Density 13.5 g cm−3
Chemical properties[2]
Electronegativity 1.3 (Pauling)
Ionization energy[3]
5.9915(2) eV,
578.09(2) kJ mol−1
Atomic radii[1][4][5]
Covalent radius 169 pm
Metallic radius 174.3 pm
Ionic radius 99 pm (Cm3+, Oh)
111 pm (Cm2+, Oh)
Thermodynamic properties[1][6]
Standard entropy 106.7(30) J K−1 mol−1
Enthalpy change of fusion 13.85 kJ mol−1
Miscellaneous
CAS number 7440-51-9
Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).

Curium (symbol: Cm) is a synthetic chemical element, a member of the actinoid series.

Curium was first prepared in 1944 in the University of Chicago Metallurgical Laboratory.[7][8] It was named after Pierre and Marie Curie, pioneers of the study of radioactivity, by analogy with gadolinium, its lanthanoid homologue, named after the Swedish chemist Johan Gadolin.

Notes and references

Notes

References

  1. 1.0 1.1 1.2 Lumetta, Gregg J.; Thompson, Major C.; Penneman, Robert A.; Eller, P. Gary Curium. 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. 3, Chapter 9, pp 1397–1443. doi:10.1007/1-4020-3598-5_9, <http://radchem.nevada.edu/classes/rdch710/files/curium.pdf>.
  2. Pauling, Linus The Nature of the Chemical Bond, 3rd ed.; Ithaca, NY, 1960. ISBN 0-8014-0333-2.
  3. Deissenberger, Rüdiger; Köhler, Stefan; Ames, Friedhelm; Eberhardt, Klaus; Erdmann, Nicole; Funk, Heike; Herrmann, Günter; Kluge, Heinz-Jürgen, et al. First Determination of the Ionization Potential of Americium and Curium. Angew. Chem., Int. Ed. Engl. 1995, 34 (7), 814–15. DOI: 10.1002/anie.199508141.
  4. Cordero, Beatriz; Gómez, Verónica; Platero-Prats, Ana E.; Revés, Marc; Echeverría, Jorge; Cremades, Eduard; Barragán, Flavia; Alvarez, Santiago Covalent radii revisited. Dalton Trans. 2008 (5), 2832–38. DOI: 10.1039/b801115j.
  5. Shannon, R. D. Revised effective ionic radii and systematic studies of interatomic distances in halids and chalcogenides. Acta Crystallogr. A 1976, 32 (5), 751–67. DOI: 10.1107/S0567739476001551.
  6. Oetting, F. L.; Rand, M. H.; Ackerman, R. J. The Chemical Thermodynamics of Actinide Elements and Compounds; IAEA: Vienna, 1976; Vol. 1. ISBN 9201490763.
  7. Seaborg, G. T.; James, R. A.; Ghiorso, A. In The Transuranium Elements; Seaborg, G. T.; Katz, J. J.; Manning, W. W., Eds.; Natl. Nucl. En. Ser., Div. IV; McGraw-Hill: New York, 1949; Vol. 14B, pp 1554–71.
  8. Ghiorso, A.; James, R. A.; Morgan, L. O.; Seaborg, G. T. Preparation of Transplutonium Isotopes by Neutron Irradiation. Phys. Rev. 1950, 78 (4), 472. DOI: 10.1103/PhysRev.78.472.

External links

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