NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Francium (Fr)

Atomic Number = 87

Atomic Weight = 223

Reference E95


Isotope    Mass        Abundance Spin Mag Moment

212Fr      211.996130  0*        5    
223Fr      223.019733  some      3/2
Notes:

*Note: Although not occuring naturally, the available spectroscopic data is for 212Fr. 

 
Fr I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s  2S1/2
      Ionization energy  32848.872 cm-1 (4.072741 eV)   Ref. ABDJ90
 
Fr II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p6  1S0