Fermium Elemental Symbol
Fermium



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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


GENERAL PROPERTIES   PHYSICAL 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
CHEMICAL STRUCTURE Heat of Fusion 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
       
IDENTIFIERS   MISCELLANEOUS  
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
InChI Key: MIORUQGGZCBUGO-UHFFFAOYSA-N  
       
       
       
       
       


Recent Research & Development for Fermium

  • First observation of atomic levels for the element fermium (Z=100). Sewtz M, Backe H, Dretzke A, Kube G, Lauth W, Schwamb P, Eberhardt K, Grüning C, Thörle P, Trautmann N, Kunz P, Lassen J, Passler G, Dong CZ, Fritzsche S, Haire RG. Phys Rev Lett. 2003 Apr 25;90(16):163002. Epub 2003 Apr 25.
  • Investigation of the solvent extraction of californium, fermium and mendelevium. Gavrilov KA, Gvuzdz E, Starý J, Seng WT. Talanta. 1966 Mar;13(3):471-6.


Fermium Isotopes


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