11. Band diagram of semiconductor-vacuum interface showing electron affinity " E" 12. Other theoretical concepts that use electron affinity include electronic chemical potential and chemical hardness. 13. Solid state electron affinities are not listed here. 14. Is the ionization energy of an atom related to it's electron affinity ? 15. Electron affinity generally increases across a period.16. The trend in electron affinity is also expected to reverse direction similarly at radium and unbinilium. 17. The one-electron reduction potential of a molecule can be used to obtain an electron affinity . 18. If oxygen doesn't have a second electron affinity , then prolly no other atom would. 19. The electron affinity of a surface is closely related to, but distinct from, its work function. 20. Elements in the same period show trends in atomic radius, ionization energy, electron affinity , and electronegativity.