1. Summary of Quantum numbers of electrons in atoms
Name
Symbol
Allowed Values
Property
Principal (Shell) n
Positive integers (1, 2, 3, etc.)
Orbital size and energy level
Orbital shape (subshell) l
Integers from 0 to (n-1)
Orbital shape (l values 0, 1,2 and 3 correspond to s, p, d and f orbitals)
Magnetic ml
Integers from
–l to +l
Orbital orientation
Spin ms
+1/2 or -1/2
Spin orientation

2. Value of n
Value of l
Value of ml
Subshell
Number of orbitals (# of e- pairs)
Total number of electrons in subshell 1 2 3
+1, 0, -1 3p 6 4

3. For an atom of oxygen, show possible quantum numbers for all eight electronsml ms
1s1 1
1/2
1s2
2s1
2s2
2px1
2py1
2pz1
2px2

4. Using the Quantum Model

5. Energy Level Diagrams
Used to show relative energies of electrons

6. Electron Configuration
Provide the same information as the energy level diagrams
List in order of increasing energy of the orbitals
Shorthand: use the previous noble gas (lists only the outer shell electrons)

7. 2p4 Example Oxygen: 1s22s22p4 Number of electrons in the orbital
Principal quantum number
orbital

8. Periodic Table