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When neptunium (Np) and plutonium (Pu) were discovered, the periodic table did not include the actinides, so these elements were placed in Groups 7B(7) and 8B(8). When americium(Am) and curium (Cm) were synthesized, they were placed in Groups 8B(9) and 8B(10). However, during chemical isolation procedures, Glenn Seaborg and his colleagues, who had synthesized these elements, could not find their compounds among other compounds of members of the same groups, which led Seaborg tosuggest they were part of a new inner transition series.(a) How do the electron configurations of these elements support Seaborg’s suggestion?

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The electronic configuration of elements supports Seaborg's suggestion in the following manner:

  • The third last shell of the inner transition elements is filled with electrons.
  • Colored ions are created by the inner transition components.
  • Variable valencies can be seen in the inner transition elements.

What are inner transition elements?

The components that make up the f-block are those where the 4f and 5f orbitals gradually fill up. Although they are officially members of group 3, these elements are displayed separately in the f-block of the periodic table. Inner transition elements are another name for the f-constituent block's parts. Lanthanoids and actinoids are the names for the two series of inner transition elements which are the 4f and 5f series, respectively. The inner transition elements U, Th, and Pa are excellent nuclear energy sources.

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