NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Yttrium (Y)

Atomic Number = 39

Atomic Weight = 88.90585

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
89Y 88.905849 100% 1/2 -0.1373
Y I  Ground State 1s22s22p63s23p63d104s24p64d5s2  2D3/2
     Ionization energy  50145.6 cm-1 (6.2173 eV)   Ref. GRTE73,JS00
Y II Ground State 1s22s22p63s23p63d104s24p65s2  1S0
     Ionization energy  98590 cm-1 (12.224 eV)   Ref. NJK91