Home 87 Fr Francium back to the periodic table

Atomic number   87
Symbol   Fr
Atomic weight   223.0197
Density [g/cm3]   ---
Melting point [°C]   27
Boiling point [°C]   677
1st Ionization energy [eV]   4.0
Electronic configuration   [Rn] 7s
Oxidation number (most stable)   1
Atomic radius [pm]   ca. 270
Ionic radius [pm]   180 (1+)
Abundance in crustal rocks [ppm]   ---
Origin of the name   named after France
Discovery   1939 by the French M. Perey
Uses   no technical significance.

This page in German - Diese Seite in Deutsch
© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.