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
252Es 252.082944 0 5 253Es 253.084818 0 7/2 4.10 254Es 254.088019 0 7 255Es 255.090270 0 7/2
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