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Learn more about the scientists who contributed to our modern understanding of the atom by watching this video.

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The 2,400-year search for the atom - Theresa Doud

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•Suggested that matter is made up of particles so small and indestructible that they can not be divided into anything smaller.

•Named the smallest piece of matter “atomos” meaning “not to be cut”

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Aristotle:

All Matter is Made Up of Four Elements: Air, Water, Fire, and Earth

Matter has Four Properties: Hot, Cold, Wet, and Dry

Most people did not question him, and Aristotle has been charged with contributing to the "death of chemistry" until the 19th century!

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• Represented atom as a solid sphere that cannot be split up

• All atoms of the same element are identical in their chemical and physical properties

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1897: J.J. Thompson: The Plum Pudding Model

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1897: J.J. Thompson: The Plum Pudding Model

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• Introduced the concept of the electron

• Plum-Pudding Model

• An atom is a solid positive particle with electrons embedded within it

• Electrons are distributed inside a positive mass like raisins in a plum pudding

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Watch this Video to learn how Thomson used a cathode ray tube to discover the electron!

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Cathode Rays Lead to Thomson's Model of the Atom

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•Gold Foil Experiment

•An atom is a small dense positive nucleus surrounded by mostly empty space where electrons can be found

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Rutherford's Famous Gold Foil Experiment

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Rutherford's Famous Gold Foil Experiment

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Rutherford’s Atomic Model - Part 1 | Atoms and Molecules | Infinity Learn

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•“Solar System” model of an atom.

•Proposed definite orbits in which electrons can be found as they travel around the nucleus (electrons cannot just be anywhere)

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Modern Model: Electron-Cloud Model or Wave-Mechanical Model

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Modern Model: Electron-Cloud Model or Wave-Mechanical Model

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• Contributing Scientists: Planck, Chadwick, Schrodinger, Mosely, Einstein, Heisenberg
• “Electrons are wave-like particles found in orbitals/clouds.”

• Shows the most probable location of an electron in an orbital. It does this by representing the electrons as a cloud of negative charge.

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Test your new knowledge by playing this Kahoot!

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Join a game of kahoot here. Kahoot! is a free game-based learning platform that makes it fun to learn - any subject, in any language, on any device, for all ages!