Atomic Theory
Published on Nov 18, 2015
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PRESENTATION OUTLINE
ATOMOS MODEL
- All matter is made up of tiny indivisible particles.
- Called them Atomos
- Other philosophers disagreed
- Rejected until 17th and 18th centuries
Photo by Pavel P.
EARTH, WIND, FIRE AND WATER
- Aristotle disagreed with Atomos model
- Asked what held the particles together
- Believed earth, wind, fire and water were the elements
- This was believed for 2000 years
Photo by fiddle oak
BILLIARD BALL MODEL
- Atoms can form compounds through chemical reactions
- They make up all matter
- Cannot be subdivided, created or destroyed
- Can be rearranged
- Atoms of different elements vary
Photo by jking89
PLUM PUDDING MODEL
- Used Cathode rays to discover it
- Atoms have a substructure of negative particles
- They are not indivisible
- Called negative particles electrons
Photo by Lachlan Hardy
MASS OF AN ELECTRON
- Mass of an electron is 9.11 X 10^ -28 gram
- Mass of an electron is 9.11 X 10^ -28 gram
- Discovered by spraying oil droplets in a machine
- Gave droplets negative charges with X-Rays
Photo by amira_a
POSITIVELY CHARGED NUCLEUS MODEL
- There is a positive nucleus at the center of an atom
- Shot a beam of alpha particles at gold foil
- Some went through, others bounced off
- Electrons circle nucleus
Photo by Brian Giesen
