NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Radium (Ra)

Atomic Number = 88

Atomic Weight = 226.0254

Reference E95

Isotope    Mass        Abundance Spin Mag Moment
223Ra 223.018501 Some 1/2 224Ra 224.020186 Some 0 226Ra 226.025402 Some 0 228Ra 228.031064 Some 0
Ra I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s2  1S0
      Ionization energy  42573.36 cm-1 (5.278423 eV)   Ref. AWT80
Ra II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s  2S1/2
      Ionization energy  81842.31 cm-1 (10.14715 eV)   Ref. M58