Home 85 At Astatine back to the periodic table
 
Atomic number   85
Symbol   At
Atomic weight   209.9871
Density [g/cm3]   ---
Melting point [°C]   302
Boiling point [°C]   337
1st Ionization energy [eV]   9.5
Electronic configuration   [Xe] 4f14 5d10  6s2 6p5
Oxidation number (most stable)   7, 5, 3, 1, 1-
Atomic radius [pm]   ---
Ionic radius [pm]   ---
Abundance in crustal rocks [ppm]   traces
Origin of the name   (greek) astates = unstable
Discovery   1940 by Corson, MacKenzie und Sergé
Uses   no technical significance.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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