1. Electron Configuration notes

2. Hydrogen’s atomic orbitals
Principal Quantum Number (n): the number of atomic orbitals, (also called Principal energy level)
As n increases, orbitals become larger and more energized
These levels contain Energy Sublevels
First energy level = 1 sublevel
Second energy level = 2 sublevels
Third energy level = 3 sublevels
Fourth energy level = 4 sublevels
There are a total of 4 sublevels: s, p, d, and f
sublevels are broken down into orbitals
a single orbital can hold 2 electrons TOTAL
1 orbital = 2 electrons
3 orbitals = 6 electrons
5 orbitals = 10 electrons

3. Periodic breakdown of the levels and sublevels

4. S-Sublevel The s-sublevel has a spherical shape
S-sublevel has only 1 orbital – it can only hold 2 electrons

5. P-sublevel P-sublevel is a dumb bell shape
p-sublevel has 3 orbitals – holding maximum 6 electrons

6. D-Sublevel
D-sublevel has 2 shapes: a single dumb bell and two dumb bells together D-sublevel has 5 orbitals – holds 10 electrons

7. F- sublevel F-sublevel has many different complex shapes
F-sublevel has 7 orbitals – holds 14 electrons

8. Periodic Breakdown of levels and sublevels
Energy level 1 has 1 sublevel = s
Energy level 2 has 2 sublevels = s and p
Energy level 3 has 3 sublevels = s, p, and d
Energy level 4 has 4 sublevels = s, p, d, and f

9. Electron Configuration
1s - 2s2p - 3s3p - 4s3d4p - 5s4d5p - 6s4f 5d6p - 7s5f6d7p

10. Electron Configuration
The arrangement of electrons in an atom
Review:
How many electrons can the s-sublevel hold?
How many electrons can the p-sublevel hold?
How many electrons can the d-sublevel hold?
How many electrons can the f-sublevel hold?
Where can each of the sublevels be found on the periodic table?

11. Let’s try Carbon: 1s22s22p2 Let’s try Aluminum: 1s22s22p63s23p1 Let’s try Iron: s22s22p63s23p64s23d6

12. Practice Problems: Element E-Config Argon 1s22s22p63s23p6 Calcium
Oxygen
Silver
Cobalt
1s22s22p63s23p64s23d7

13. Now you try: Do these in your notes
Element:
E-Config:
Fluorine
Magnesium
Sulfur
Tin
Strontium