Science
Periodic Table - Elements - Actinium

Symbol Ac
Atomic Number 89
Relative Atomic Mass
12C = 12.0000
227.0728 (227Ac)
Atomic Radius
pm
188
First Ionisation Energy
kJ mol-1
499
Electronegativity 1.1
Density
kg m-3
10060 [293 K]
Molar Volume
cm3
22.6
Thermal Conductivity
W m-1 K-1
12 [300 K]
Melting Point
K
1320 ± 50
Boiling Point
K
3470 ± 300
Number of Isotopes 26
Ground State Electron
Configuration
[Rn]6d17s2
Term Symbol 2D3/2
Discovery Discovered by A. Debierne (Paris, France) in 1899
Name Derived From Greek aktinos meaning 'ray'
Name in Other
Languages
 Croatian Aktinij
 Danish actinium
 Dutch actinium
 Finnish aktinium
 French actinium
 German Actinium
 Italian attinio
 Norwegian actinium
 Portugueseactínio
 Spanish actinio
 Swedish aktinium
Peter van der Krogt's Element Multidict - element name translations in over 48 langauges


Page compiled: Wed Sep 05 18:37:53 GMT+01:00 2001