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Aristotle and fellow greeks

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Jin Lee

on 15 October 2014

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Transcript of Aristotle and fellow greeks

Aristotle considered Democritus' Atomic Theory to be useless.
Because everyone valued Aristotle's mind, they agreed with him for everything.
Atomic Theory Timeline
Democritus (460- 370 BC)
Aristotle vs. Democritus
Antoine Lavoisier (1743-1794)
Known as the Father of Chemistry
Devised the Metric System
Proposed/Discovered the Law of Conservation of Matter
Compiled the first 33 elements in his textbook.
(484-322 BC)
Aristotle did not believe in the existence of atoms.
Instead he believed that all matters were made up of Earth, Water, Fire and Air and that it could be endlessly divided.
A greek philosopher that developed the idea of atoms or "atomos".
He created the first atomic theory which states that atoms are...
-Made of a single material formed into different shapes and sizes
John Dalton
Proposed an atomic theory which states...
-All substances are made up of atoms.
-Cannot be divided, created or destroyed.
-Atoms join with other substances to create something different
Calculated the atomic weights of many elements.
Sir JJ Thompson
During his experiment with cathode ray tubes, he discovered "electrons" which led him to believe that an atom could be divided into smaller parts.
Plum Pudding Model
JJ Thompson stated that most atoms have a negative and positive charge located through the positive material.
Robert Millikan

Discovered the mass and charge of an electron with the Oil Drop Experiment.
Earnest Rutherford
Referred to as the "Father of Nuclear Physics"
Performed the Gold Foil Experiment
-Discovered the Nucleus and Proton
-The Protons are surrounded by electrons.
Niels Bohr
Electrons travel around the nucleus in a definite path.
Suggested that the electrons jump from different levels.
Also created the Solar System Model
Erwin Schrodinger
Expanded upon Bohr's theory
Suggested that the electron's exact location cannot be found, therefore he viewed them in a region called the Electron Cloud.
Wrote equations to describe the electron around the nucleus as a "wavefunction"
James Chadwick
Realized that the atomic mass was double the number of proton.
Discovered the neutrons
Albert Einstein
Einstein was known for many things
-General theory of relativity
-Quantum mechanics
But he was most known for his equation E=mc 2
Otto Hahn, Lise Meitner and Fritz Strassmann (1938)
They were the first people to explain that their experiment resulted in the split of the nucleus.
This later became known as the process of fission.
Friedrich Hund
He was known for the electronic structures of atoms and molecules.
He helped introduce the method of using molecular orbitals.
Wolfgang Pauli
Pauli exclusion principle
States that each atom's electrons, have their own quantum state.
Aufbau Principle
Work Cited
Google Images
The History of Atomic Theory Handout
Originates from Pauli's exlusion principle.
When more electrons are added, the atom assumes their most stable condition
Full transcript