Americium Elemental Symbol
Americium



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Américium Americium Americio Amerício Americio Americium

Americium Bohr ModleAmericium is a Block F, Group 3, Period 7 element. The number of electrons in each of Americium's shells is 2, 8, 18, 32, 25, 8, 2 and its electron configuration is [Rn] 5f7 7s2. The americium atom has a radius of 173.pm and it's Van der Waals radius is 244.pm. In its elemental form, CAS 7440-35-9, americium has a silvery white appearance. Americium was discovered by Glenn T. Seaborg, Ralph A. James, Stanley G. Thompson and Albert Ghiorso in 1944. It was the fourth synthetic transuranic element to be discovered and was named after the continent of North America.

Americium is artificially produced in small quantities for research purposes. Due to its radioactivity, americium is harmful. Americium 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

Americium Properties


GENERAL PROPERTIES   PHYSICAL PROPERTIES  
Symbol: Am Melting Point: 1176 oC, 2148.8 oF, 1449.15 K
Atomic Number: 95 Boiling Point: 2011 oC, 3651.8 oF, 2284.15 K
Atomic Weight: 243 Density: 13670 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 14.39 kJ·mol−1
Electrons: 95 Thermal Conductivity: 10 W·m−1·K−1
Protons: 95 Thermal Expansion: N/A
Neutrons: 148 Electrical Resistivity: 0.69 µΩ·m
Electron Configuration: [Rn] 5f77s2 Electronegativity: 1.3 (Pauling scale)
Atomic Radius: 173 pm Tensile Strength: N/A
Covalent Radius: 180±6 pm Molar Heat Capacity: 62.7 J·mol−1·K−1
Van der Waals radius: 244 pm Young's Modulus: N/A
Oxidation States: 6, 5, 4, 3, 0 Shear Modulus: N/A
Phase: Solid  Bulk Modulus: N/A
Crystal Structure: hexagonal Poisson Ratio: N/A
Magnetic Ordering: paramagnetic Mohs Hardness: N/A
1st Ionization Energy: 578 kJ·mol−1 Vickers Hardness: N/A
2nd Ionization Energy: N/A Brinell Hardness: N/A
3rd Ionization Energy: N/A Speed of Sound: N/A
       
IDENTIFIERS   MISCELLANEOUS  
CAS Number: 7440-35-9 Abundance in typical human body, by weight: N/A
ChemSpider ID: 22405 Abundance in typical human body, by atom: N/A
PubChem CID: 23966 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 T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso
Beilstein Number: N/A Discovery Date: 1944
SMILES Identifier: [Am]  
InChI Identifier: InChI=1S/Am Other Names: Americio
InChI Key: LXQXZNRPTYVCNG-UHFFFAOYSA-N  
       
       
       
       
       


Recent Research & Development for Americium

  • O.S. Vălu, D. Staicu, O. Beneš, R.J.M. Konings, P. Lajarge, Heat capacity, thermal conductivity and thermal diffusivity of uranium–americium mixed oxides, Journal of Alloys and Compounds, Volume 614, 25 November 2014
  • Denis Horlait, Richard Caraballo, Florent Lebreton, Christophe Jégou, Pascal Roussel, Thibaud Delahaye, Self-irradiation and oxidation effects on americium sesquioxide and Raman spectroscopy studies of americium oxides, Journal of Solid State Chemistry, Volume 217, September 2014
  • Yury Malyshkin, Igor Pshenichnov, Igor Mishustin, Walter Greiner, Monte Carlo modeling of spallation targets containing uranium and americium, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 334, 1 September 2014
  • Marcus Christl, Xiongxin Dai, Johannes Lachner, Sheila Kramer-Tremblay, Hans-Arno Synal, Low energy AMS of americium and curium, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 331, 15 July 2014
  • E. Remy, S. Picart, T. Delahaye, I. Jobelin, F. Lebreton, D. Horlait, I. Bisel, P. Blanchart, A. Ayral, Fabrication of uranium-americium mixed oxide pellet from microsphere precursors: application of CRMP process, Journal of Nuclear Materials, Available online 5 July 2014
  • Huang Huang, Songdong Ding, Ning Liu, Yuxuan Wu, Dongping Su, Song Huang, Extraction of trivalent americium and europium from nitric acid solution with a calixarene-based diglycolamide, Separation and Purification Technology, Volume 123, 26 February 2014
  • Denis Horlait, Florent Lebreton, Aurélie Gauthé, Marie Caisso, Bénédicte Arab-Chapelet, Sébastien Picart, Thibaud Delahaye, Americium-based oxides: Dense pellet fabrication from co-converted oxalates, Journal of Nuclear Materials, Volume 444, Issues 1–3, January 2014
  • Chikashi Suzuki, Tsuyoshi Nishi, Masami Nakada, Tomohito Tsuru, Mitsuo Akabori, Masaru Hirata, Yoshiyuki Kaji, DFT study on the electronic structure and chemical state of Americium in an (Am,U) mixed oxide, Journal of Physics and Chemistry of Solids, Volume 74, Issue 12, December 2013
  • B. Raditzky, S. Sachs, K. Schmeide, A. Barkleit, G. Geipel, G. Bernhard, Spectroscopic study of americium(III) complexes with nitrogen containing organic model ligands, Polyhedron, Volume 65, 28 November 2013
  • Yong Lu, Yu Yang, Fawei Zheng, Bao-Tian Wang, Ping Zhang, Electronic, mechanical, and thermodynamic properties of americium dioxide, Journal of Nuclear Materials, Volume 441, Issues 1–3, October 2013
  • J. Lamontagne, Y. Pontillon, E. Esbelin, S. Béjaoui, B. Pasquet, P. Bourdot, J.M. Bonnerot, Determining the americium transmutation rate and fission rate by post-irradiation examination within the scope of the ECRIX-H experiment, Journal of Nuclear Materials, Volume 440, Issues 1–3, September 2013
  • Florent Lebreton, Denis Horlait, Thibaud Delahaye, Philippe Blanchart, Fabrication and characterization of U1−xAmxO2±δ compounds with high americium contents (x = 0.3, 0.4 and 0.5), Journal of Nuclear Materials, Volume 439, Issues 1–3, August 2013
  • I. Sato, M. Suto, S. Miwa, T. Hirosawa, S. Koyama, Americium and plutonium release behavior from irradiated mixed oxide fuel during heating, Journal of Nuclear Materials, Volume 437, Issues 1–3, June 2013
  • Claude Degueldre, Cedric Cozzo, Matthias Martin, Daniel Grolimund, Cyprian Mieszczynski, Americium characterization by X-ray fluorescence and absorption spectroscopy in plutonium uranium mixed oxide, Journal of Solid State Chemistry, Volume 202, June 2013
  • Kosuke Tanaka, Masahiko Osaka, Shuhei Miwa, Takashi Hirosawa, Ken Kurosaki, Hiroaki Muta, Masayoshi Uno, Shinsuke Yamanaka, Preparation and characterization of the simulated burnup americium-containing uranium–plutonium mixed oxide fuel, Journal of Nuclear Materials, Volume 420, Issues 1–3, January 2012
  • Florent Lebreton, Damien Prieur, Aurélien Jankowiak, Magaly Tribet, Caroline Leorier, Thibaud Delahaye, Louis Donnet, Philippe Dehaudt, Fabrication and characterization of americium, neptunium and curium bearing MOX fuels obtained by powder metallurgy process, Journal of Nuclear Materials, Volume 420, Issues 1–3, January 2012
  • Alok Rout, Sanat Karmakar, K.A. Venkatesan, T.G. Srinivasan, P.R. Vasudeva Rao, Room temperature ionic liquid diluent for the mutual separation of europium(III) from americium(III), Separation and Purification Technology, Volume 81, Issue 2, 22 September 2011
  • K. Maeda, K. Katsuyama, Y. Ikusawa, S. Maeda, Short-term irradiation behavior of low-density americium-doped uranium–plutonium mixed oxide fuels irradiated in a fast reactor, Journal of Nuclear Materials, Volume 416, Issues 1–2, 1 September 2011
  • J. Lamontagne, S. Béjaoui, K. Hanifi, Ch. Valot, L. Loubet, Swelling under irradiation of MgO pellets containing americium oxide: The ECRIX-H irradiation experiment, Journal of Nuclear Materials, Volume 413, Issue 3, 30 June 2011
  • P. Gotcu-Freis, J.-Y. Colle, J.-P. Hiernaut, R.J.M. Konings, The vaporisation behaviour of americium dioxide by use of mass spectrometry, Journal of Nuclear Materials, Volume 409, Issue 3, 28 February 2011

Americium Isotopes


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