Which one of the following characteristics of the transition metals is associated with their catalytic activity?

Step-by-step solution

Transition elements are elements that have partially filled d-orbitals. These elements show variable oxidation state because their valence electrons in two different sets of orbitals, that is (n-1)d and ns . The energy difference between these orbitals is very less, so both the energy levels can be used for bond formation. Thus, transition elements have variable oxidation states. Related Theory The presence of unpaired electrons leads to the formation of metal-metal covalent bonds along with the metallic bonds. The