Transition metals possess variable oxidation states because they have

Transition metals are elements that have partially filled d orbitals, which are orbitals that are located in the middle of the periodic table. These d orbitals have the capacity to hold different numbers of electrons, and this property allows transition metals to exhibit variable oxidation states. An oxidation state is a measure of the number of electrons that an atom has lost or gained in a chemical reaction. In the case of transition metals, their partially filled d orbitals can lose or gain electrons to form different oxidation states. This means that transition metals can lose or gain different numbers of electrons, depending on the specific reaction they are involved in, and can therefore exhibit different oxidation states. In summary, transition metals possess variable oxidation states because of the presence of electrons in their d orbitals, which have the capacity to hold different numbers of electrons and can lose or gain electrons to form different oxidation states.