User:CtrlAdrian/Valence electron

The beginning of my additions to the Valence Electron Page.

"The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized. In groups 1–12, the group number matches the number of valence electrons; in groups 13–18, the units digit of the group number matches the number of valence electrons. (Helium is the sole exception.)"

This is the part of the article that I'm going to edit. More specifically, I'm going to add language on how some Periodic Table's are written a bit different as shown and how to be able to determine the amount of valence electrons an element has by seeing the labeled columns.