NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Einsteinium (Es)

Atomic Number = 99

Atomic Weight = (254)

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Es I  Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f117s2 415/2
       Ionization energy  51800 cm-1 (6.42 eV)   Ref. S74

Es II Ground State 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p65f11(4I15/2)7s (15/2,1/28
       Ionization energy  [97000] cm-1 (12.0 eV)   Ref. CNWM70