palladium4dYes, Palladium is a transition metal because it has incompletely filled d-orbital in its most common oxidation state (Pd 2+).. Let me explain the exact meaning of this. According toA representation of the atomic spectrum of palladium. Ionisation Energies and electron affinity. The electron affinity of palladium is 53.7 kJ mol ‑e ionisation energies of