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Lanthanide
Actinide
Superactinide
Ion of Berkelium, Z=97, I.P.=290000 cm-1
References:
Varga L. et al. // J. Inorg. Nucl. Chem. - 1973 - Vol. 35 - P. 2787-2794.
Brewer L. // JOSA - 1971 - Vol. 61 - P. 1666-1682.