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 


*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