https://en.m.wikipedia.org/wiki/Molar_ionization_energies_of_the_elements

01 12 13 24
02 11 14 23
03 10 15 22
04 09 16 21
05 08 17 20
06 07 18 19

04 09 16 21

04 Beryllium
09 Fluorine
16 Sulfur
21 Scandium

04 Beryllium (Cation)
09 Fluorine
16 Sulfur
21 Scandium (Cation)