Why is there one large increase in ionization energies for each element?

Which atoms form ions that are larger than the atoms?

I have a test tomorrow and these are the questions I have troubles understanding.

2 answers

I don't understand question 1. A large increase for IP from what? What are you comparing it with? For #2, elements that form anions are larger ions than the atom.
Valence electrons are easier to remove (ionize) than electrons in the shell under the valence shell. A complete shell, closer to the nucleus is more difficult to disturb.
After the valence electrons are removed, removal of an electron from the shell below requires much more energy. That is the reason for the abrupt increase in ionization energy.
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