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 ofAtomic number (Z): 46: Group: group 10: Period: period 5: Block d-block Electron confuration [] 4d 1Electrons per shell: 2, 8, 18, 18: Physical properties; Phase at