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The Story of the Atom

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Rebekah Lusk

on 4 November 2013

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Transcript of The Story of the Atom

Stated that all matter is made of "atoms"
400 BC-Democritus
1808- John Dalton
Dalton's Atomic Theory explained the Law of Definite Composition, the Law of Multiple Proportions, and the Law of Conservation of Mass.
Dalton's Atomic Model: an indivisible sphere uniformly dense without charge.
The Story of the Atom
1897- J.J. Thompson
Credited with the discovery of the first subatomic particle; the electron.
Thompson's Atomic Model: "Plum Pudding."
1911- Ernest Rutherford
Credited with the discovery of the proton. Through his gold foil experiment, he concluded that there is a dense, positive center in every atom called the nucleus.
1932- James Chadwick
Credited with the discovery of the Neutron. Was a student of Rutherford at Manchester University.
1913- Niels Bohr
Introduced the Bohr model, which depicts the atom as small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
1926- Erwin Schrödinger
Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position.
Schrödinger's atomic model: portrayed as a nucleus surrounded by an electron cloud. Where the cloud is most dense, the probability of finding the electron is greatest, and vice versa.
The Modern Atomic Model
Electrons are in constant motion around the nucleus, protons and neutrons jiggle within the nucleus, and quarks jiggle within the protons and neutrons.
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