3. Electromagnetic Spectrum

4. Atomic Emission Spectrum

5. Atomic Emission Spectrum
Continuous
Spectrum
Atomic Emission Spectrum

7. Glowing Metal

8. Photoelectric Effect

9. Click On Picture

10. Bohr Model (review) Only works for hydrogen atoms
Electrons don’t move in circles
The energy was right, but not because e- circle like planets

11. The Hydrogen Spectrum
The three groups of lines in the hydrogen spectrum correspond to the transitions of electrons from higher energy levels to lower energy levels

12. The Bohr Ring Atom
n = 4
n = 3
n = 2
n = 1

13. Quantum Mechanical Model
Louis de Broglie -1924
Matter could move like a wave
Like standing waves
The vibrations of a stringed instrument

14. Schrödinger Equation

15. Quantum Numbers A set of 4 “numbers” that describe an electron Tell us
Energy level
Shape of orbital
Orientation of orbital around nucleus
Spin

16. Principal quantum number
Principal quantum number (n)
Energy level of the electron
7 energy levels
Correspond to 7 periods (rows) of periodic table

17. Angular Momemtum Quantum Number
Energy levels are divided into sublevels called orbitals
An ORBITAL is a region in space where there is a high probability of finding an electron

18. Orbitals Denoted by the letters s, p, d, and f
Each orbital can hold 1 or 2 electrons only!

19. 1 orbital per energy level
S orbitals
l = 0
1 orbital per energy level

20. 3 orbitals per energy level
P orbitals
3 orbitals per energy level

21. 3 orbitals per energy level
P orbitals
l = 1
3 orbitals per energy level

22. 5 orbitals per energy level
D orbitals
l = 2
5 orbitals per energy level

23. 7 orbitals per energy level
F Orbitals
l = 3
7 orbitals per energy level

24. Magnetic Quantum Number
Magnetic quantum number (m I)
Gives the axis orientation
Tells direction in each shape (x,y,z)

25. Spin Quantum Number
Describes the direction the electron is spinning.

26. Spin Quantum Number
Describes the direction the electron is spinning.

29. Electron Configuration
We follow 3 rules to get the correct electron configuration for each atom
Aufbau Principle
Pauli exclusion Principle
Hund’s Rule

30. Energy Levels in atoms
Sublevels
Orbitals

31. Energy Levels in atoms
Sublevels
Orbitals