[Collegedude_21]

A question was asked today about ionization energy that I wasn't sure of the answer to:

If you have an excited state of Ne, in which the 1s electron is excited up to the 3s subshell, what happens to the overall ionization energy of Neon? Can you calculate exact values for the IE without experimenting, or is an estimation based on other elements IE the best you can do?

I had assumed, that the ionization energy for EACH subshell up through 2p would increase (that is, the 1s, 2s, and 2p subshell's would all have a higher ionization energy), and that the IE of the 3s shell would be extremely low.

Am I incorrect in how I'm thinking about that? If so, why?