electron shells

Question 1

what are the ‘shell rules’?

Answer 1

1. electrons always occupy shells
2. the lowest shells are always filled first(closest to the nucleus)
3. only a certain number of electrons are allowed in each shell
   1st- 2 2nd- 8 3rd- 8
4. atoms are much ‘happier’ when they have full shells
5. in most atoms, the outer shell is usually not full, so that makes them want to react to fill them