Curium Elemental Symbol

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Curium Curium Curio Cúrio Curio Curium

Curium Bohr ModelCurium is a Block P, Group 3, Period 7 element. The number of electrons in each of curium's shells is 2, 8, 18, 32, 25, 9, 2 and its electron configuration is [Rn] 5f7 6d1 7s2. The curium atom has a radius of In its elemental form, curium's CAS number is 7440-51-9. Curium is radioactive. It is produced by bombarding uranium or plutonium with neutrons in nuclear reactors. Curium is found in spent nuclear fuel and small amounts are produced for research. Curium was discovered by Glenn T. Seaborg, Ralph A. James and Albert Ghiorso at the University of California, Berkeley in 1944. The element was named in honor of Marie and Pierre Curie.

Curium information, including technical data, safety data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on earth, conductivity and thermal properties are included.

  • Properties
  • Research
  • Isotopes
  • Other Elements

Curium Properties

Symbol: Cm Melting Point: 1345 oC, 2453 oF, 1618 K
Atomic Number: 96 Boiling Point: 3110 °C, 5630 °F, 3383 K
Atomic Weight: 247 Density: 13300 kg m-3
Element Category: Actinide Liquid Density @ Melting Point: N/A
Group, Period, Block: n/a, 7, f Specific Heat: N/A
    Heat of Vaporization N/A
CHEMICAL STRUCTURE Heat of Fusion 15 kJ·mol−1
Electrons: 96 Thermal Conductivity: N/A
Protons: 96 Thermal Expansion: N/A
Neutrons: 151 Electrical Resistivity: 1.25 µΩ·m
Electron Configuration: [Rn] 5f76d17s2 Electronegativity: 1.3 (Pauling scale)
Atomic Radius: 174 pm Tensile Strength: N/A
Covalent Radius: 169±3 pm Molar Heat Capacity: N/A
Van der Waals radius: N/A Young's Modulus: N/A
Oxidation States: 4, 3 (amphoteric oxide) Shear Modulus: N/A
Phase: Solid Bulk Modulus: N/A
Crystal Structure: hexagonal close-packed Poisson Ratio: N/A
Magnetic Ordering: antiferromagnetic (paramagnetic transition at 52 K) Mohs Hardness: N/A
1st Ionization Energy: 581 kJ·mol−1 (estimated) Vickers Hardness: N/A
2nd Ionization Energy: N/A Brinell Hardness: N/A
3rd Ionization Energy: N/A Speed of Sound: N/A
CAS Number: 7440-51-9 Abundance in typical human body, by weight: N/A
ChemSpider ID: 22415 Abundance in typical human body, by atom: N/A
PubChem CID: 23979 Abundance in universe, by weight: N/A
MDL Number: N/A Abundance in universe, by atom: N/A
EC Number: N/A Discovered By: Glenn Seaborg, Ralph James, Albert Ghiorso
Beilstein Number: N/A Discovery Date: 1944
SMILES Identifier: [Cm]  
InChI Identifier: InChI=1S/Cm Other Names: Curio

Recent Research & Development for Curium

  • Sensitizing curium luminescence through an antenna protein to investigate biological actinide transport mechanisms. Sturzbecher-Hoehne M, Goujon C, Deblonde GJ, Mason AB, Abergel RJ. J Am Chem Soc. 2013 Feb 20;135(7):2676-83. doi: 10.1021/ja310957f. Epub 2013 Feb 11.
  • Curium(III) citrate speciation in biological systems: a europium(III) assisted spectroscopic and quantum chemical study. Heller A, Barkleit A, Foerstendorf H, Tsushima S, Heim K, Bernhard G. Dalton Trans. 2012 Dec 7;41(45):13969-83. doi: 10.1039/c2dt31480k. Epub 2012 Oct 1.
  • Circularly polarized luminescence of curium: a new characterization of the 5f actinide complexes. Law GL, Andolina CM, Xu J, Luu V, Rutkowski PX, Muller G, Shuh DK, Gibson JK, Raymond KN. J Am Chem Soc. 2012 Sep 19;134(37):15545-9. Epub 2012 Sep 11.
  • Separation of americium from curium by oxidation and ion exchange. Burns JD, Shehee TC, Clearfield A, Hobbs DT. Anal Chem. 2012 Aug 21;84(16):6930-2. doi: 10.1021/ac3018394. Epub 2012 Jul 31.
  • Curium(III) borate shows coordination environments of both plutonium(III) and americium(III) borates. Polinski MJ, Wang S, Alekseev EV, Depmeier W, Liu G, Haire RG, Albrecht-Schmitt TE. Angew Chem Int Ed Engl. 2012 Feb 20;51(8):1869-72. doi: 10.1002/anie.201107956. Epub 2012 Jan 13. No abstract available.
  • Hydration shell structure and dynamics of curium(III) in aqueous solution: first principles and empirical studies. Atta-Fynn R, Bylaska EJ, Schenter GK, de Jong WA. J Phys Chem A. 2011 May 12;115(18):4665-77. doi: 10.1021/jp201043f. Epub 2011 Apr 18.
  • Sorption of curium by silica colloids: effect of humic acid. Kar AS, Kumar S, Tomar BS, Manchanda VK. J Hazard Mater. 2011 Feb 28;186(2-3):1961-5. doi: 10.1016/j.jhazmat.2010.12.092. Epub 2010 Dec 25.
  • Chemical speciation of trivalent actinides and lanthanides in biological fluids: the dominant in vitro binding form of curium(III) and europium(III) in human urine. Heller A, Barkleit A, Bernhard G. Chem Res Toxicol. 2011 Feb 18;24(2):193-203. doi: 10.1021/tx100273g. Epub 2010 Dec 13.
  • Solvation effects on isomeric preferences of curium(iii) complexes with multidentate phosphonopropionic acid ligands: CmH(2)PPA(2+) and CmHPPA(+) complexes. Cao Z, Balasubramanian K, Calvert MG, Nitsche H. Inorg Chem. 2009 Oct 19;48(20):9700-14. doi: 10.1021/ic901054h.
  • Spectroscopic properties and potential energy surfaces for curium hydrides: CmH(2), CmH(2)(+), CmH, and CmH(+). Balasubramanian K, Cao Z. J Phys Chem A. 2009 Nov 12;113(45):12512-24. doi: 10.1021/jp903795q.
  • Gas-phase energetics of actinide oxides: an assessment of neutral and cationic monoxides and dioxides from thorium to curium. Marçalo J, Gibson JK. J Phys Chem A. 2009 Nov 12;113(45):12599-606. doi: 10.1021/jp904862a.
  • The biokinetics and radiotoxicology of curium: a comparison with americium. Ménétrier F, Taylor DM, Comte A. Appl Radiat Isot. 2008 May;66(5):632-47. doi: 10.1016/j.apradiso.2007.12.002. Epub 2007 Dec 15. Review.
  • Comparative biokinetics of trivalent radionuclides with similar ionic dimensions: promethium-147, curium-242 and americium-241. Priest ND. Radiat Res. 2007 Sep;168(3):327-31.
  • Emergence of strong exchange interaction in the actinide series: the driving force for magnetic stabilization of curium. Moore KT, van der Laan G, Haire RG, Wall MA, Schwartz AJ, Söderlind P. Phys Rev Lett. 2007 Jun 8;98(23):236402. Epub 2007 Jun 5.
  • Curium(III) complexation with pyoverdins secreted by a groundwater strain of Pseudomonas fluorescens. Moll H, Johnsson A, Schäfer M, Pedersen K, Budzikiewicz H, Bernhard G. Biometals. 2008 Apr;21(2):219-28. Epub 2007 Jul 25.
  • The curium aqua ion. Skanthakumar S, Antonio MR, Wilson RE, Soderholm L. Inorg Chem. 2007 Apr 30;46(9):3485-91. Epub 2007 Apr 4.
  • Association of europium(III), americium(III), and curium(III) with cellulose, chitin, and chitosan. Ozaki T, Kimura T, Ohnuki T, Kirishima A, Yoshida T, Isobe H, Francis AJ. Environ Toxicol Chem. 2006 Aug;25(8):2051-8.
  • Speciation of the curium(III) ion in aqueous solution: a combined study by quantum chemistry and molecular dynamics simulation. Yang T, Bursten BE. Inorg Chem. 2006 Jul 10;45(14):5291-301.
  • A high-pressure structure in curium linked to magnetism. Heathman S, Haire RG, Le Bihan T, Lindbaum A, Idiri M, Normile P, Li S, Ahuja R, Johansson B, Lander GH. Science. 2005 Jul 1;309(5731):110-3.
  • Uptake of trivalent actinides (curium(III)) by hardened cement paste: a time-resolved laser fluorescence spectroscopy study. Stumpf T, Tits J, Walther C, Wieland E, Fanghänel T. J Colloid Interface Sci. 2004 Aug 1;276(1):118-24.

Curium Isotopes

Curium is an artificial element. It has no stable isotopes.