Which of the following elements is classified as a transition metal in the periodic table?

Transition metals are elements that have partially filled d orbitals, which gives them many unique chemical properties. In the periodic table, these are found mainly in the central block, especially groups 3 through 12. Among common choices, iron (Fe) and gold (Au) are classic examples of transition metals because they have d electrons that can be lost or shared in many ways. For instance, iron can exist as Fe²⁺ or Fe³⁺ ions, showing the variable oxidation states typical of transition metals. Thus, iron would be the element classified as a transition metal.