Principal (shell) quantum number - n
Describes the energy level in the atom (1 through 7)The maximum number of electrons in n is 2n2
2. Angular (subshell) quantum number - l
Describes the sublevel in nEach energy level has n sublevels
3. Magnetic quantum number - m
Describes the orbital within ls has 1 orbitalp has 3 orbitalsd has 5 orbitalsf has 7 orbitals
4. Spin quantum number - s
Describes the spin of the electrons in an orbital.Electrons in the same orbital must have oppisite spins.Possible spins are clockwise or counterclockwise.