1. Electron Configurations for the modern model of the atom

2. Orbitals
are the region of most probable location of electrons in an atom
Heisenberg Uncertainty Principle
Impossible to know exact location and momentum of any electron in an atom.

4. The orbitals in the atom correspond to the blocks of the periodic table

5. S orbital spherical
fits 2 electrons

6. P orbitals dumbbells
fit 2 electrons each

7. D orbitals Clover Leaf
fit 2 electrons each

8. F orbitals

9. Not so easy to draw so we revert to the Bohr model
Draw Magnesium
Bohr Model of Atom
Modern Model (Quantum)
12n
12p
12n
12p
Not so easy to draw so we revert to the Bohr model

10. How to fill an orbital diagram
and figure out its electron configuration
How to fill an orbital diagram

11. Showing energy of electrons in their orbitals
Empty orbital diagram
Showing energy of electrons in their orbitals
least energy at the bottom to the most going up 1s 2s 2p 3s 3p

12. e- represented with arrows
e- occupy lowest E levels first
e- will occupy separate orbitals if possible
e- in the same orbital must have opposite spins

13. H 1s 2s 2p 3s 3p
1s1

14. H

15. He 1s 2s 2p 3s 3p
1s2

16. He

17. Li 1s 2s 2p 3s 3p
1s22s1

18. Li

19. Be 1s 2s 2p 3s 3p
1s22s2

20. B 1s 2s 2p 3s 3p
1s22s22p1

21. B

22. C 1s 2s 2p 3s 3p
1s22s22p2

23. N 1s 2s 2p 3s 3p
1s22s22p3

24. O 1s 2s 2p 3s 3p
1s22s22p4

25. K 1s 2s 2p 3s 3p 4s 4p 3d
1s22s22p63s23p64s1

26. K

27. Ca 1s 2s 2p 3s 3p 4s 4p 3d
1s22s22p63s23p64s2

28. 1s 2s 2p 3s 3p 4s 4p 3d Sc
1s22s22p63s23p64s23d1

29. Sc

30. Electron summary p can hold a total of 6 electrons
s can hold 2 electrons
p can hold a total of 6 electrons
2 in each orbital
d can hold a total of 10 electrons

31. So how many electrons in each energy level?
E level 1 = 2 e-
E level 2 = 8 e-
E level 3 = 18 e-
E level 4 = 32 e-
But NEVER more
than 8 valence e- because of the order the e- fill!

33. The End