NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Praseodymium (Pr)

Atomic Number = 59

Atomic Weight = 140.90765

Reference E95

Isotope    Mass        Abundance Spin Mag Moment
141Pr 140.907647 100% 5/2 +4.3
Pr I  Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f36s2  49/2
      Ionization energy  44140 cm-1 (5.473 eV)   Ref. WSPC78
Pr II Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f3(49/2)6s  (9/2,1/24
      Ionization energy  85100 cm-1 (10.55 eV)   Ref. SR65