Atomic Theory
Published on Nov 19, 2015
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PRESENTATION OUTLINE
HISTORY OF ATOMS
- Democritus (460 B.C.)
- Develops the idea of atoms
- Pounded up materials in pestile until
- he reduced to smaller particles called
- "ATOMA"
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ARISTOTLE (
- Aristotle believed in 4 elements: air, water,earth, and fire.
- Everyone believed him over Democritus when really
- Democritus was right.
- He believed that no matter how many times you cut matter in half
- You still end up with a small piece of matter.
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ANTOINE LAVOISIER(1799)
- First person to use the balance
- Proposed the combustion theory
- This led to mass measurements
- Also proposed the Law of Conversation of mass.
JOSEPH LOUIS PROUST(1799)
- He proposed the law of Constant Composition
- It was very radical.
JOHN DALTON(1803)
- He believed that all matter is composed of atoms
- Atoms cannot be made or destroyed
- Compounds are formed from atoms of the constituent elements.
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MICHAEL FARADAY(1832)
- Studied a coined term called "electrolysis"
- It was splitting molecules with electricity.
- He was not a proponent of atomism.
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HENRI BECQUEREL(1896)
- He was the discovery of Radioactivity
- This term is used to describe some elements.
J.J. THOMSON(1897)
- He identified the negatively charged electron in cathode tube
- He proposed the "plum pudding" model of the atom.
- It was more massive.
MARIE &PIERRE CURIE(1898)
- They were interested in Becquerel's discovery.
- Her and her husband discovered the radioactive-
- Elements; which are polonium & radium.
MAX PLANCK(1900)
- Used the idea of quanta, to explain hot glowing matter.
ALBERT ENSTIEN(1905)
- Published the famous equation
- E=mc2
