electronic stucture

Question 1

What are the chemical rules needed for electron shells?

Answer 1

1.Electrons always occupy a shell
2.The lowest energy level is always filled first.
3.Only a certain number of electrons are allowed in each cell (1st shell:2 2nd shell:8 3rd shell:8)
4.Atoms want a full outer shell 8 electrons(to be in lowest energy state) and that
is why they react with other elements.