A. Trans uranium elements
B. Transition elements
C. Lanthanides
D. Actinides
B. Transition elements
Transition elements: These elements (groups 3-12 in the periodic table) have incompletely filled d-orbitals in either their atomic state or in their common ions. This incomplete filling of d-orbitals contributes to their characteristic properties, including variable oxidation states, ability to form colored compounds, and involvement in coordination complexes.
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