Americium

Atomic properties
Atomic number	95
Electron configuration	[Rn] 5f7 7s2
Physical properties
Melting point	876(5) °C (1149(5) K)
Boiling point	2067 °C (2340 K)
Density	13.671 g cm−3
Electric resistivity	68 × 10−6 Ω cm
Chemical properties
Electronegativity	1.3 (Pauling)
Ionization energies
1st	5.9738(2) eV,; 576.38(2) kJ mol−1
2nd	12.5 eV; 1206 kJ mol−1
3rd	18.8 eV; 1814 kJ mol−1
Atomic radii
Covalent radius	180 pm
Metallic radius	173 pm
Ionic radius	85 pm (Am4+, Oh); 97.5 pm (Am3+, Oh); 121 pm (Am2+, Oh)
Thermodynamic properties
Standard entropy	55 J K−1 mol−1
Enthalpy change of fusion	14.4 kJ mol−1
Enthalpy change of vaporization	230.2 kJ mol−1
Molar heat capacity (Cp)	25.5 J K−1 mol−1
Miscellaneous
CAS number	7440-35-9
EC number	231-144-4
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
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plutonium ← americium → curium

Eu
↑
Am
↓
—

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

Notes and references

Notes

References

↑ ^1.0 ^1.1 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. 3, Chapter 8, pp 1265–1395. doi:10.1007/1-4020-3598-5_8, <http://radchem.nevada.edu/classes/rdch710/files/americium.pdf>.
↑ ^2.0 ^2.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 1450–86. ISBN 0-08-022057-6.
↑ Electrical resistivities. In Kaye & Laby Tables of Physical & Chemical Constants, 16th ed., 1995; Chapter 2.6.1, <http://www.kayelaby.npl.co.uk/general_physics/2_6/2_6_1.html>. (accessed 4 April 2011).
↑ Pauling, Linus The Nature of the Chemical Bond, 3rd ed.; Ithaca, NY, 1960. ISBN 0-8014-0333-2.
↑ 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.
↑ Carlson, Thomas A.; Nestor, C. W., Jr.; Wasserman, Neil; Mcdowell, J. D. Calculated ionization potentials for multiply charged ions. At. Data Nucl. Data Tables 1970, 2, 63–99. DOI: 10.1016/S0092-640X(70)80005-5.
↑ 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.
↑ 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.
↑ Oetting, F. L.; Rand, M. H.; Ackerman, R. J. The Chemical Thermodynamics of Actinide Elements and Compounds; IAEA: Vienna, 1976; Vol. 1. ISBN 9201490763.

External links

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[R.26S-1] 1.0 ^1.1 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. 3, Chapter 8, pp 1265–1395. doi:10.1007/1-4020-3598-5_8, <http://radchem.nevada.edu/classes/rdch710/files/americium.pdf>.

[G.26E-2] 2.0 ^2.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 1450–86. ISBN 0-08-022057-6.

[3] Electrical resistivities. In Kaye & Laby Tables of Physical & Chemical Constants, 16th ed., 1995; Chapter 2.6.1, <http://www.kayelaby.npl.co.uk/general_physics/2_6/2_6_1.html>. (accessed 4 April 2011).

[4] Pauling, Linus The Nature of the Chemical Bond, 3rd ed.; Ithaca, NY, 1960. ISBN 0-8014-0333-2.

[5] 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.

[6] Carlson, Thomas A.; Nestor, C. W., Jr.; Wasserman, Neil; Mcdowell, J. D. Calculated ionization potentials for multiply charged ions. At. Data Nucl. Data Tables 1970, 2, 63–99. DOI: 10.1016/S0092-640X(70)80005-5.

[7] 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.

[8] 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.

[9] Oetting, F. L.; Rand, M. H.; Ackerman, R. J. The Chemical Thermodynamics of Actinide Elements and Compounds; IAEA: Vienna, 1976; Vol. 1. ISBN 9201490763.

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Americium

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