palladium4dA 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 ofYes, 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 to