Electronic Structure

Question 1

Electron shell rules

Answer 1

Electrons always occupy shells
(Sometimes called energy levels)

The lowest energy levels are always filled first

Only a certain number of electrons are allowed in each shell :
1st shell: 2
2nd shell: 8
3rd shell: 8

Atoms are much happier when they have full electron shells- like the gases in group 0

In most atoms, the outer shell is not full and this makes the atom want to react to fill it