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Lanthanide
Actinide
Superactinide
Ion of Californium, Z=98, I.P.=181000 cm-1
References:
Brewer L. // JOSA - 1971 - Vol. 61 - P. 1666-1682.
Brewer L. // JOSA - 1971 - Vol. 61 - P. 1666-1682.