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 ofThe atomic number is the number of electrons in that element. The atomic number of palladium is 46. That is, the number of electrons in palladium is forty-six. Therefore, a palladium atom will