Chemistry- Electronic structure (year 9)

Question 1

What are the electron shell rules?

Answer 1

1) electrons always occupy shells (energy levels)
2) The lowest energy levels are always filled first- the once closest to the nucleus
3) Only a certain number of electrons are allowed in each shell (1st= 2, 2nd=8, 3rd=8)

Question 2

When are atoms the most happiest?

Answer 2

when they have full electron shells- like the noble gases in group 0

Question 3

What happens in most atoms?

Answer 3

the outer shell is not full and this makes the atom want to react to fill it