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Lanthanide
Actinide
Superactinide
Ion of Mendelevium, Z=101, I.P.=53230 cm-1
References:
Brewer L. // JOSA - 1971 - Vol. 61, ¹ 8 - P. 1101-1111.
Sluis K., Nugent L. // Phys. Rev. A -1972 - Vol. 6, ¹ 1 - P. 86-94.