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Page 1: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Democritus -Greek philosopher 450 BC

Page 2: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Aristotle

-born 384 BC

-Greek philosopher,educator & scientist

-student of plato

Page 3: 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”

Page 4: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

2 Mg + O2 2 MgO 10.0g 6.58g 16.58g

16.58g 16.58g

Page 5: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Joseph Proust-1754-1826

-French Chemist

-Law of Definite Proportions

H20Looking at …

Page 6: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

JohnDalton

-English school teacher & scientist

-Early 1800’s

-Atomic Theory of Matter

-Law of Multiple Proportions

Page 7: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Dalton’s Periodic Chart

Page 8: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Dalton’s Model of an Atom

Page 9: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

William Crookes

-1832-1919

-English Chemist

-developed the cathode ray tube

Page 10: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Cathode Ray Tube in Action

Cathode Ray Tubes

http://www.physicslessons.com/exp61.htm
Page 11: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato
Page 12: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Michael Faraday-1791-1867

-English chemist and Physicist

-Electromagnetic induction

Induction

http://www.slcc.edu/schools/hum_sci/physics/tutor/2220/em_induction?
Page 13: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Ben Franklin

-1706-1790

-scientist, inventor, statesman

-looked at electrical charges

Page 14: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Chadwick-studied alpha particles to discover neutrons

Page 15: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

-English physicist early 1900’s

-Worked with cathode ray tubes

JJ Thomson

Page 16: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Electron Beam in CRT

Page 17: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

+-

+

+

++

++

-

-

--

-

Plum Pudding Model

Page 18: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Ernest Rutherford-New Zealand Scientist early 1900’s -Alpha scattering experiment

Page 19: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato
Page 20: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

98% of the particles passes straight through 2% of the particles deflected off at varying angles 0.01% of the particles bounced straight back

Page 21: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

+

-++++

+ +

-

-

--

-

Rutherford’s Model of an atom

Page 22: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Max Planck-German Physicist

-1858-1947

-studied light emitted from objects

Page 23: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

E = h v

Planck’s Theory … What does it mean?

Page 24: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Photoelectric Effect

Page 25: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Albert Einstein

-1879-1955

Page 26: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Niels Bohr

-Danish physicist early 1900’s

-Used Rutherford’s planetary idea

-Used Plank’s idea of “quanta”

Page 27: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Planetary model of an atom

Page 28: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Robert Millikan-1868-1953

-American physicist

Page 29: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Milikan’s Oil Drop Experiment

On-line Model

http://www.britannica.com/nobel/cap/omillik001a4.html
http://www.britannica.com/nobel/cap/omillik001a4.html
Page 30: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Werner Heisenberg

-1901-1976

-Uncertainty Principle

Page 31: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Erwin Schrodinger

What’s that? Sign your planner?We’re talking quantum mechanics here folks …

Page 32: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Schrodinger wave model of an atom

orbitron

http://www.shef.ac.uk/chemistry/orbitron/AOs/1s/index.html
Page 33: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Henri Becquerel

Marie and Pierre Curie

Page 34: Democritus -Greek philosopher 450 BC. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

Henry Moseley

-1887-1915

-Rutherford’s student


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