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Lanthanide
Actinide
Superactinide
Ion of Thorium, Z=90, I.P.=468000 cm-1
References:
Safronova U., Safronova M. // Phys. Rev. A - 2011 - Vol. 84 - P 052515.
Safronova U., Safronova M. // Phys. Rev. A - 2011 - Vol. 84 - P 052515.