What are ionization energy and electron affinity?
Ionization energy is the energy needed to remove an electron from an atom or an ion at its gaseous state.
Electron affinity is the energy released or absorbed when an electron is added to an atom or ion at its gaseous state.
I just made two videos on these topics recently, I hope you find them helpful:
Periodic Trends | Ionization Energy.
Periodic Trends | Electron Affinity.