Question

Which of the following concepts underlies all the others: electron affinity, ionization energy, effective nuclear charge, atomic size?

Answer 1

effective nuclear charge Zeff.

Zeff controls electron affinity, by determining the attractive force between the atom and the electron.

Zeff controls IP for the same reason.

Zeff underlies atomic size, because higher Zeff draws the valence electrons in closer.

Answer 2

Thank you!