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Lanthanide
Actinide
Superactinide
Ion of Holmium, Z=67, I.P.=343000 cm-1
References:
Dodson C., Zia R. // Phys. Rev. A - 2012 - Vol. 86 - P. 125102..
Ropp R., Carroll B. // J. Phys. Chem. - 1973 - Vol. 77 - P. 339-346.