Information

Curium (Cm) properties


Atomic mass, symbol and atomic number

Curium is an artificially created element with the element symbol Cm and atomic number 96. In the periodic table it belongs to the actinoids with an atomic mass of 247.07 u. The chemical element discovered by Glenn T. Seaborg in 1944 is radioactive and is in a solid state of aggregation at room temperature.

Characteristics: Curium (English Curium)

General
Chemical element:Curium
Symbol:Cm
Atomic number:96
Group:actinides
Period:7
Block:f-block
Series:actinides
Appearance:silver
explorers:Glenn T. Seaborg
Year of discovery:1944
Atomic properties
Atomic mass:247.07 u
Atomic radius:174 pm
Covalent radius:170 pm
Van der Waals radius:???
Electron configuration:Rn 5f7 6d1 7s2
ionization:581 kJ / mol
Physical Properties
Physical state:firmly
Density:13.51 g / cm3
Crystal structure:hexagonal
Magnetism:
molar volume:18,05 · 10-6 m3/ mol
Mohs hardness:unknown
Melting point:1340 ° C
Boiling point:3110 ° C
Heat of fusion:unknown
Heat of vaporization:unknown
Thermal conductivity:unknown
Chemical properties
electronegativity:1,3

Did you know that ...

  • Curium was named after the couple Marie and Pierre Curie, but had nothing to do with the discovery of the element itself?
  • the discoverer of the element, Glenn T. Seaborg, was still involved in the discovery of nine other elements during his lifetime?
  • the longest-lived isotope of curium has a half-life of more than 15 million years?
  • Curium is formed in the fission of other radioactive elements in nuclear reactors?