electron shells

Question 1

electron shell rules

Answer 1

1. electrons occupy shells
   2.the smaller shells are filled first
   3.only a certain amount of shells are allowed in each shell: 2.8.8

Question 2

working out electron shells

Answer 2

e.g nitrogen has 7 electrons so following the rules the first shell has 2 so the second shell takes the remaining 5 electrons= 2.5