1. HISTORY OF THE ATOMIC THEORY IMPORTANCE OF ATOMIC THEORY MAJOR CONTRIBUTORS THE “MODERN ATOMIC THEORY”

2. DEMOCRITUS ~400 B.C. STATED THE FIRST THEORY ABOUT ATOMS ATOMOS - INDIVISIBLE

3. ARISTOTLE ~300 B.C. DISAGREED WITH D’S THEORY MATTER IS MADE OF HYLE (ONE STUFF BUT FORM CHANGES BY TREATMENTS)

4. GIORDANO BRUNO ~1600 EXECUTED B/C OF HIS THEORIES ON ATOMS

5. ROBERT BOYLE & ISAAC NEWTON ~1600 A.D. (WORKED INDEPENDENTLY) DISCUSSED THE POSSIBILITY OF ATOMS EXISTING PROGRESS IMPEDED BY THE CHURCH

6. ANTOINE LAVOISIER ~1700 A.D. KNOWN FOR HIS EXPERIMENTATION SKILLS STATED THE LAW OF CONSERVATION OF MATTER

7. ANTOINE LAVOISIER STATED THE LAW OF CONSERVATION OF MATTER (HINTS AT THE REARRANGEMENT OF MATTER IN REACTIONS)

8. JOSEPH PROUST ~1700 A.D. STATED THE LAW OF DEFINITE PROPORTIONS (HINTS AT THE “LEGO”NESS OF MATTER)

9. JOHN DALTON ~1800 A.D. DID “LIBRARY” RESEARCH STATED DALTON’S ATOMIC THEORY

10. MODERN ATOMIC THEORY DIFFERENCES BETWEEN DALTON’S AND MODERN: ATOMS CAN BE DIVIDED ATOMS OF SAME ELEMENT CAN HAVE DIFF MASSES

11. “WONDERINGS” Q: “What is matter made of?” A: Atoms Q: “What are ATOMS made of?” A: “hmmmmm… good question!”

12. HISTORY OF ATOMIC STRUCTURE

13. THOMSON 1897 CATHODE RAYS = e - DETERMINED THE CHARGE TO MASS RATIO DEVELOPED THE “PLUM PUDDING MODEL” OF ATOM

14. RUTHERFORD “EARLY 1900’S” PROPERTIES OF RADIOACTIVITY  = He +2  = e -  = LIGHT

15. RUTHERFORD (AGAIN) 1910-1911 GOLD FOIL EXPERIMENT NUCLEAR MODEL

16. MILLIKAN Early 1910’S OIL DROP EXPERIMENT DETERMINED THE CHARGE OF AN ELECTRON THEREFORE, WE KNOW THE MASS

17. RUTHERFORD (YET AGAIN) 1919 PROTONS

18. CHADWICK 1932 NEUTRONS