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Lanthanide
Actinide
Superactinide
Ion of Einsteinium, Z=99, I.P.=183000 cm-1
References:
Brewer L. // JOSA - 1971 - Vol. 61 - P 1666-1688.
Brewer L. // JOSA - 1971 - Vol. 61 - P 1666-1688.