89 AcActinium
Atomic Weight: 227.0278                  Shells: 2,8,18,32,18,9,2
Group: Trans. Metal                      Filling orbital: 6d1
Crystal Structure: Cubic face centered   Covalent radius: ?
Oxidation States:3                       Atomic radius: ?
Electronegativity, Pauling: 1.1          Atomic volume: 22.54 cm³/mol
State at RT: Solid                       First ionization potential: 5.17 V
Melting Point: 1320K                     2nd ionization potential: 12.126 V
Boiling Point: 3470K                     3rd ionization potential: ?
Density @ 293K: 10.07 g/cm³              Specific heat: ?
Electrical conductivity: ?               Heat of vaporization: ?
Thermal conductivity: 0.12 W/cmK         Heat of fusion: ?

Element Nuclides
NuclideAbundance Weight  SpinHalf-Life Decay Modes
Ac225  0.%      225.02310   10.0d    a
Ac226  0.%      226.    1   1.224d   b-,ECa,a
Ac227  0.%      227.02781.5 21.77y   b-,a
Ac228  0.%      228.    3   6.15h    b-

Name origin: Greek: aktinos (ray).
Description: Silvery-white radioactive metal
Discovered by: André Debierne
Year: 1899
Location: France
Sources: Extremely rare, found in all uranium ores. Usually obtained by treating radium with neutrons in a reactor.
Uses: ?

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