Fermium Elemental Symbol

French German Italian Portuguese Spanish Swedish
Fermium Fermium Fermio Férmio Fermio Fermium

Fermium Bohr ModelFermium is a Block F, Group 3, Period 7 element. The number of electrons in each of fermium's shells is 2, 8, 18, 32, 30, 8, 2 and its electron configuration is [Rn] 5f12 7s2. The fermium atom has a Van der Waals radius is 245 pm. In its elemental form, fermium's CAS number is 7440-72-4. Fermium is a synthetic element that is produced by the bombardment of lighter actinides with neutrons in a nuclear reactor. Fermium was discovered by Albert Ghiorso at the Lawrence Berkeley National Laboratory in 1952. It was named after Enrico Fermi, Professor of Theoretical Physics at the University of Rome. Fermi was a Nobel Prize winner whose work lead to the discovery of slow neutrons which then resulted in the discovery of nuclear fission and the production of elements lying beyond those included on the periodic table of 1938. Fermium was the eighth transuranic element of the actinide series to be discovered.

Fermium 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

Fermium Properties

Symbol: Fm Melting Point: 1527 oC, 2780.6 oF, 1800.15 K
Atomic Number: 100 Boiling Point: N/A
Atomic Weight: 257 Density: N/A
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
Electrons: 100 Thermal Conductivity: N/A
Protons: 100 Thermal Expansion: N/A
Neutrons: 157 Electrical Resistivity: N/A
Electron Configuration: [Rn] 5f127s2 Electronegativity: 1.3 (Pauling scale)
Atomic Radius: N/A Tensile Strength: N/A
Covalent Radius: N/A Molar Heat Capacity: N/A
Van der Waals radius: 245 pm Young's Modulus: N/A
Oxidation States: 2, 3 Shear Modulus: N/A
Phase: Solid Bulk Modulus: N/A
Crystal Structure: N/A Poisson Ratio: N/A
Magnetic Ordering: N/A Mohs Hardness: N/A
1st Ionization Energy: 627 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: 7440-72-4 Abundance in typical human body, by weight: N/A
ChemSpider ID: 22434 Abundance in typical human body, by atom: N/A
PubChem CID: 23998 Abundance in universe, by weight: N/A
MDL Number: N/A Abundance in universe, by atom: N/A
EC Number: N/A Discovered By: Lawrence Berkeley Nat'l Laboratory
Beilstein Number: N/A Discovery Date: 1952
SMILES Identifier: [Fm]  
InChI Identifier: InChI=1S/Fm Other Names: Fermio

Recent Research & Development for Fermium

  • M. Sewtz, H. Backe, C.Z. Dong, A. Dretzke, K. Eberhardt, S. Fritzsche, C. Grüning, R.G. Haire, G. Kube, P. Kunz, J. Lassen, W. Lauth, G. Passler, P. Schwamb, P. Thörle, N. Trautmann, Resonance ionization spectroscopy of fermium (Z=100), Spectrochimica Acta Part B: Atomic Spectroscopy, Volume 58, Issue 6, 30 June 2003
  • Stefan Cwiok, Piotr Rozmej, Adam Sobiczewski, Zygmunt Patyk, Two fission modes of the heavy fermium isotopes, Nuclear Physics A, Volume 491, Issue 2, 9 January 1989
  • , Metabolic data for fermium, Annals of the ICRP, Volume 19, Issue 4, 1988
  • , Fermium, Annals of the ICRP, Volumes 11–13, Part 2, 1983
  • , Fermium, Annals of the ICRP, Volume 8, Issues 1–3, 1982
  • , Metabolic data for fermium, Annals of the ICRP, Volume 6, Issues 2–3, 1981
  • B. Fricke, G. Soff, Dirac-Fock-Slater calculations for the elements Z = 100, fermium, to Z = 173, Atomic Data and Nuclear Data Tables, Volume 19, Issue 1, January 1977
  • F. Go¨nnenwein, H. Schultheis, R. Schultheis, K. Wildermuth, Substructure effects in the fission of fermium, Physics Letters B, Volume 57, Issue 4, 21 July 1975
  • Yu.Ts. Oganessian, A.S. Iljinov, A.G. Demin, S.P. Tretyakova, Experiments on the production of fermium neutron-deficient isotopes and new possibilities of synthesizing elements with Z > 100, Nuclear Physics A, Volume 239, Issue 2, 24 February 1975
  • S. Hubert, M. Hussonnois, L. Brillard, G. Goby, R. Guillaumont, Determination simultanee de constantes de formation de complexes citrique de l'Americium, du curium, du Californium, de l'Einsteinium et du fermium, Journal of Inorganic and Nuclear Chemistry, Volume 36, Issue 10, October 1974

Fermium Isotopes

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