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Fred Bayer | Rosenheim | Germany | (+49) 8031 86550 | fred@bayerf.de

87 – Fr – Francium

Fr Fr-223 (half life 22 minutes) is part of the decay chain of U-235, so traces of Francium exist in the pitchblende shown here. Amount: 0.1 g pitchblende, corresponding to 0.36 ag or 950 atoms of Fr-223.

Physical and chemical data
Atomic mass223.0197
Density? g·cm-3
Melting point27 °C
Boiling point677 °C
Abundance1.00e-21 %
Electronegativy0.9
Oxydation levels1
Electron configuration[Rn]7s

H   He
Li Be   B C N O F Ne
Na Mg   Al Si P S Cl Ar
K Ca Sc   Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y   Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg  
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