Home 88 Ra Radium back to the periodic table
 
Atomic number   88
Symbol   Ra
Atomic weight   226.0254
Density [g/cm3]   5.50
Melting point [°C]   700
Boiling point [°C]   1140
1st Ionization energy [eV]   5.279
Electronic configuration   [Rn] 7s2
Oxidation number (most stable)   2
Atomic radius [pm]   223
Ionic radius [pm]   143 (2+)
Abundance in crustal rocks [ppm]   6*10-7
Origin of the name   (lat.) radius = ray
Discovery   1898 by Marie and Pièrre Curie
Uses   no technical significance.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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