1. The Evolution of
the Atomic Theory
By John, Caroline, and Gabi

2. Greek Observations
•
•
–
–

3. Discovery ofChemical
Elements
•
•
–
c.1661

4. Groundbreaking Discoveries on Mass
and Energy
•
•
c. 1774

5. Groundbreaking Discoveries on Mass
and Energy
•
•
1798 - 1806

6. John Dalton (1766-1844)
•
•
–
1808

7. Dalton’s Atomic Theory

8. First Table of Atomic Masses
•
•
•

9. Avogadro’s Hypothesis
•
–
–
1811

10. Interpretations of
Avogadro’s Hypothesis
•

11. The Electron
•
•
•
–
1898 - 1903

12. Electron Charge
–
–
1909

13. Assumptions from
Thomson’s Theory
•
•
•

14. The Plum Pudding Model
Negatively charged electrons are
randomly distributed “plums” on the
positive cloud of cake.

15. The Nuclear Atom
•
•
•
1911

16. The Modern Atom
•
–
–
–

17. How to Read an Atomic Symbol
•
•
•

18. Planck’s Findings:
The Foundations of the Quantum Model
•
•
c. 1900

19. The Photoelectric Effect
•
•
•
1921

20. The Atomic Spectrum of Hydrogen
•
•
•
1927

21. The Bohr Model
•
•
•
1913

22. The Atom’s Quantum
Mechanical Model
•
•

23. Wave Functions
•
•

24. An Overview of the
Quantum Mechanical Model
•
•
1920s