In detail

Fermium (Fm) properties


Atomic mass, symbol and atomic number

fermium is an artificially created element with the element symbol Fm and atomic number 100. In the periodic table it belongs to the actinoids with an atomic mass of 257.09 u. The chemical element discovered by Glenn T. Seaborg in 1952 is radioactive and is in a solid state of aggregation at room temperature.

Profile: Fermium (English Fermium)

General
Chemical element:fermium
Symbol:fm
Atomic number:100
Group:actinides
Period:7
Block:f-block
Series:actinides
Appearance:unknown
explorers:Glenn T. Seaborg
Year of discovery:1952
Atomic properties
Atomic mass:257,09 u
Atomic radius:unknown
Covalent radius:unknown
Van der Waals radius:unknown
Electron configuration:Rn 5f12 7s2
ionization:627 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:unknown
Magnetism:unknown
molar volume:unknown
Mohs hardness:unknown
Melting point:unknown
Boiling point:unknown
Heat of fusion:unknown
Heat of vaporization:unknown
Thermal conductivity:unknown
Chemical properties
electronegativity:1,3

Did you know that ...

  • Fermium could be detected for the first time after the explosion of a hydrogen bomb?
  • the shortest-lived isotope of Fermium (259Fm) has a half-life of only 1.5 s?
  • Fermium was named after the nuclear physicist Enrico Fermi, who himself is not the discoverer of the chemical element?