PROBLEM 89P

What is the maximum number of electrons that can occupy the n= 3 quantum shell?

Solution 89P

Step 1:

The third shell has 3 subshells: the s subshell, which has 1 orbital with 2 electrons, the p subshell, which has 3 orbitals with 6 electrons, and the d subshell, which has 5 orbitals with 10 electrons, for a total of 9 orbitals and 18 electrons.