Actinium
Elemental State Ac
Electron Configuration 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s26d1
First Ionization Potential 5.17 eV
Electron Affinity  
Z*  
Pauling Electronegativity 1.1
Covalent Radius  
Metallic Radius  
Ionic Radius  
van der Waal's Radius  
Melting Point 1051 oC
Boiling Point 3200 oC
Density 10.07 g/cm3 (calculated)
Other Properties All isotopes are radioactive

227Ac half-life = 21.77 years