1. Electron Energy Levels Notes
mass of an atom = the # of p+ and n in the nucleus.
size of an atom depends on the # and arrangement of e-.
Start here

2. Electron Energy Levels
Draw this
E = Energy level e- = electron

3. Electron Energy Levels
Each energy level can hold a limited # of electrons.
Level 1 → 2 e-
Level 2 → 8 e-
Level 3 → 18 e-
Level 4 → 32 e-
Level 5 → 50 e-

4. Energy levels are broken up into sub-levels.
There are 4 sub-levels: s, p, d, and f

5. Electron Energy Levels
Each sub-level can hold a limited # of e-
s level can hold up to 2 e-
p level can hold up to 6 e-
d level can hold up to 10 e-
f level can hold up to 14 e-

6. # of electrons in each sub-level Total electrons in energy level
5.1
Energy Level
# of sublevels
Letter of sublevels
# of electrons in each sub-level
Total electrons in energy level 1 s 2
s p 6 8 3
s p d 10 18 4
s p d f 14 32
Next year move this slide to beginning.

8. Electron Configuration Symbols
# of e- in sub level
1s2
Energy Level
Sub Level
(s, p, d, f )

9. Let’s draw some atoms! Need your periodic table!
Helium Atomic # = 2 mass = 4 p+ = 2 n = 2 e- = 2
2e-
2 p+
2 n
Electron Configuration = 1s2

10. Let’s draw some atoms! Need your periodic table!
Carbon Atomic # = 6 mass = 12 p+ = 6 n = 6 e- = 6
4e-
2e-
6 p+
6 n
Electron Configuration = 1s2 2s2 2p2

11. Let’s draw some atoms! Need your periodic table!
Oxygen
6e-
Atomic # = mass = p+ = n = e- =
2e-
8 p+
8 n
Electron Configuration = 1s2 2s2 2p4

12. Let’s draw some atoms! Need your periodic table!
Neon
8e-
Atomic # = mass = p+ = n = e- =
2e-
10 p+
10 n
Neon has a full outer e- level = very stable
Electron Configuration =
1s2 2s2 2p6

13. Let’s draw some atoms! Need your periodic table!
Sodium
1e-
Atomic # = mass = p+ = n = e- =
8e-
2e-
11 p+
12 n
Sodium has nearly empty outer shell = wants to combine with other atoms
Electron Configuration =
1s2 2s2 2p63s1

14. Let’s draw some atoms! Need your periodic table!
Silicon
4e-
Atomic # = mass = p+ = n = e- =
8e-
2e-
14 p+
14 n
Electron Configuration =
1s2 2s2 2p63s23p2

15. # of electrons in each sub-level Total electrons in energy level
5.1
Energy Level
# of sublevels
Letter of sublevels
# of electrons in each sub-level
Total electrons in energy level 1 s 2
s p 6 8 3
s p d 10 18 4
s p d f 14 32
Next year move this slide to beginning.

16. Let’s draw some atoms! Need your periodic table!
Argon
18 p+
22 n
2e-
8e-
Atomic # = mass = p+ = n = e- =
Argon has full p-level = stable
Electron Configuration =
1s2 2s2 2p63s23p6

17. Let’s draw some atoms! Need your periodic table!
Zinc
Atomic # = mass = p+ = n = e- =
Electron Configuration =
1s22s22p63s23p63d104s2

18. Add to your Table of Contents!
(fireworks)