An electronic structure of an atom should have 18 electrons as the maximum no. in the third shell and 2(4^2) electrons as the maximum no. in the fourth shell(I hope my concept is right),but why the electrons formed in the 3rd shell again after two electrons are formed in the 4th shell?Why not just leave the 3rd shell and continue in the 4th shell? Please help me~
[ Last edited by secret on 2005-12-31 at 09:45 AM ]