Americium (Am) - Properties

Atomic mass, symbol and atomic number

americium is an artificially created element with the element symbol Am and the atomic number 95. In the periodic table it belongs to the actinoids with an atomic mass of 243.061 u. The chemical element discovered by Glenn T. Seaborg in 1944 is radioactive and is in a solid state of aggregation at room temperature.

Profile: Americium

Chemical element:americium
Symbol:At the
Atomic number:95
explorers:Glenn T. Seaborg
Year of discovery:1944
Atomic properties
Atomic mass:243.061 u
Atomic radius:184 pm
Covalent radius:180 pm
Van der Waals radius:228 pm
Electron configuration:Rn 5f7 7s2
ionization:578 kJ / mol
Physical Properties
Physical state:firmly
Density:13.67 g / cm3
Crystal structure:hexagonal
molar volume:1,778 · 10-5 m3/ mol
Mohs hardness:???
Melting point:1176 ° C
Boiling point:2607 ° C
Heat of fusion:14.4 kJ / mol
Heat of vaporization:238 kJ / mol
Thermal conductivity:10W
Chemical properties

Did you know that ...

  • Will americium be used as an energy source for spacecraft in the future?
  • the discoverer of the element, Glenn T. Seaborg, was still involved in the discovery of nine other elements during his lifetime?
  • Depending on the oxidation state, americium occurs in many different colors?