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Democritus
-Greek philosopher 450 BC
Aristotle
-born 384 BC
-Greek philosopher,
educator & scientist
-student of plato
Lavoisier
-French chemist 1700’s
-“Law of Conservation of Mass”
2 Mg + O2
10.0g
16.58g
6.58g
2 MgO
16.58g
16.58g
Joseph Proust
-1754-1826
-French Chemist
-Law of Definite Proportions
Looking at …
H20
JohnDalton
-English school teacher & scientist
-Early 1800’s
-Atomic Theory of Matter
-Law of Multiple Proportions
Dalton’s
Periodic Chart
Dalton’s Model of an Atom
William Crookes
-1832-1919
-English Chemist
-developed the cathode ray tube
Cathode Ray Tubes
Cathode Ray Tube in Action
Michael Faraday
-1791-1867
-English chemist and Physicist
-Electromagnetic induction
Induction
Ben Franklin
-1706-1790
-scientist, inventor, statesman
-looked at electrical charges
Chadwick
-studied alpha particles
to discover neutrons
JJ Thomson
-English physicist early 1900’s
-Worked with cathode ray tubes
Electron Beam in CRT
Plum Pudding Model
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Ernest Rutherford
-New Zealand Scientist early 1900’s
-Alpha scattering experiment
98% of the particles passes straight through
2% of the particles deflected off at varying angles
0.01% of the particles bounced straight back
Rutherford’s
Model of an atom
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Max Planck
-German Physicist
-1858-1947
-studied light emitted from objects
Planck’s Theory … What does it mean?
E = hv
Photoelectric Effect
Albert Einstein
-1879-1955
Niels Bohr
-Danish physicist early 1900’s
-Used Rutherford’s planetary idea
-Used Plank’s idea of “quanta”
Planetary model of an atom
Robert Millikan
-1868-1953
-American physicist
Milikan’s Oil Drop Experiment
On-line Model
Werner Heisenberg
-1901-1976
-Uncertainty Principle
What’s that? Sign your planner?
We’re talking quantum mechanics
here folks …
Erwin Schrodinger
Schrodinger wave model of an atom
orbitron
Henri Becquerel
Marie and Pierre Curie
Henry Moseley
-1887-1915
-Rutherford’s student