1. Quantum Numbers This is a way to label electrons.
There are four numbers for each electron in an atom.
Principal
Azimuth
Magnetic
Spin

2. 1st Quantum Number - Principal
Stands for the orbital in which the electron resides
Is written as a number between 1-7.
Can be found using a periodic table.

4. 2nd Quantum Number- Azimuth
Describes the shape of the orbital of the electron
An orbital is an area where an electron is likely to be found.
Corresponds to block in periodic table
Four shapes s p d f

5. 2nd Quantum Number - Azimuth
s orbital
Only holds 2 electrons
Shaped like a 3d sphere
p orbital
Can hold 6 electrons
Shaped liked a 3d dumbbell.

6. 2nd Quantum Number - Azimuth
d orbital
Holds up to 10 electrons
Shaped like a 3d dumbbell with a ring around the middle
f orbital
Holds up 14 electrons.
Don’t worry about the shape; it’s complicated.

8. 3rd Quantum Number – Magnetic
Describes which suborbital the electron occupies
s has 1 suborbitals
p has 3 suborbitals
d has 5 suborbitals
f has 7 suborbitals
We represent the suborbital by a _____

9. 4th Quantum Number- Spin
Each suborbital can hold two electrons
Electrons have different spins
Represented by arrows pointing up or down

11. Quantum Numbers for Atom ID
If you ID all the electrons in an atom, you can identify the atom by quantum numbers

12. Practice
Helium
Magnesium
Gallium