Home 89 Ac Actinium back to the periodic table

Atomic number   89
Symbol   Ac
Atomic weight   227.0278
Density [g/cm3]   10.07
Melting point [°C]   1050
Boiling point [°C]   3200
1st Ionization energy [eV]   6.9
Electronic configuration   [Rn] 6d 7s2
Oxidation number (most stable)   3
Atomic radius [pm]   187,8
Ionic radius [pm]   118 (3+)
Abundance in crustal rocks [ppm]   small traces
Origin of the name   (greek) actinoeis = ray emitting
Discovery   1899 by André Debierne
Uses   for the generation of neutrons.

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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