1. Representative elements: The Representative Elements are those elements within the first two families (Groups I and II on the far left) and the last six families or groups (on the right) of the Periodic Table. 2. d-transition elements: Set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) are d-transition elements. They have partially filled d sub-level orbitals. 3. inner transition elements: The inner transition elements are two series of elements known as the lanthanides and actinides. They belong to periods 6 and 7. From the standpoint of their electronic structure, thelanthanides are characterized by the gradual filling of the 4f subshell, and the actinides, by the filling of the 5f subshell. Consequently, they are also called "f-block" elements.
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