9
because
3^2 = 9
or because
3 s has 1
3 p has 3
3 d has 5
and 1 + 3 + 5 = 9
Note, each of those orbits can have electrons with spins of + or - 1/2
so total of 18 electrons for n = 3
what is the total number of orbitals associated with principal quantum no. n =3
1 answer