1. Electron Location Part II

2. Quantum Numbers
Principal quantum number (n) - describes the SIZE of the orbital or ENERGY LEVEL of the atom.
Angular quantum number (l) or sublevels - describes the SHAPE of the orbital.
Magnetic quantum number (m) - describes an orbital's ORIENTATION in space.
Spin quantum number (s) - describes the SPIN or direction (clockwise or counter-clockwise) in which an electron spins.

3. Principle Quantum Number (n) or Energy Level
integer values used to specify the shell/size/level the electron is in
describes how far away from the nucleus the electron shell or level under consideration is
the lower the number, the closer the energy level is to the atom's nucleus and less energy
maximum # of electrons that can fit in an energy level is given by formula 2n2

6. Angular Quantum Number (l) or Sub-level
determines the shape of the orbital
they are numbered but are also given letters referring to the orbital type
l=0 refers to the s-orbitals
l=1 refers to the p-orbitals
l=2 refers to the d-orbitals
l=3 refers to the f-orbitals

8. Magnetic quantum number (m) or Orbitals
the third of a set of quantum numbers
tells us how many orbitals there are of a particular type and their orientation in space of a particular orbital
only two electrons can fit in an orbital
= electron

9. S – orbitals only holds two electrons

10. P – orbitals holds up to six electrons

11. P - orbitals

12. D – orbitals holds up to 10 electrons

14. F – orbitals holds up to 14 electrons

18. Spin quantum number (s)
the fourth of a set of quantum numbers
number specifying the direction of the spin of an electron around its own axis.
only two electrons of opposite spin may occupy an orbit
the only possible values of a spin quantum number are +1/2 or -1/2.

20. Principle Quantum # (n)
LEVEL/SIZE 1 2 3 4
Angular Quantum # (l)
ORBITAL SHAPE or SUBLEVEL s
s p
s p d
s p d f
Magnetic Quantum # (m)
AXIS/
ORIENTATION
or ORBITALS
1 orbital
4 total
orbitals
9 total orbitals
16 total orbitals
Spin Quantum # (s)
DIRECTION OF ELECTRON SPIN
2 e-
8 e-
18 e-
32 e-

21. Principle energy level (n) Type of sublevel
Table 3-6b Orbitals and Electron Capacity of the First Four Principle Energy Levels
Principle energy level (n)
Type of sublevel
Number of orbitals per type
Number of orbitals per level(n2)
Maximum number of electrons (2n2) 1 s 2 4 8 p 3 9 18 d 5 16 32 f 7