The Atomic Theory Project

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The Atomic Theory Project

Thomson Plum Pudding ModelJJ Thomson (1856-1940) used the cathode ray tube to discover electrons. He believed an atom was composed of negatively charged electrons floating in a positively charged environment.

Planetary ModelDiscovered by Niels Bohn (1885-1962), this model basically illustrated that electrons are located in a specific ring outside of the nucleus, and that the electrons rotate/revolve around the nucleus in a motion similar to that of planets and planetary systems.

Quantum Mechanical ModelThis model is the one that's still currently in use today. Many scientists contributed to it including: Chadwick, Planck, De Broglie, Schrodinger, Einstein, and others. The Model basically states that electrons are not in a fixed position at any given time. Instead, they are constantly in motion the atom in their electron clouds. They move in a motion similar to that of photon waves.

Nuclear ModelErnest Rutherford (1871-1937) used the gold foil experiment to discover the nucleus, the dense center of the atoms. He basically discovered that the atom is mostly empty space and that electrons were outside of the nucleus. Lastly, he named/identified the protons in 1920.

Billiard Ball ModelBy: Democritus (460-370 BC) and John Dalton (1776-1844)Democritus is the ancient scientist who initially disovered atoms, and he's the one who is accredited with naming them atoms from the greek word "atomos." John Dalton added to Democritus's theory by coming up with an atomic theory that contains five points. In his theory, he outlines how atoms cannot be created or destroyed, how atoms of an element are the same in terms of properties, and how atoms are combined and separated in reactions.

Unit 3 Project: The Atomic TheoryBy: Abdullah S.

ImagesFirst row -- From left to right: Democritus, John Dalton, JJ Thomson, Ernest Rutherford, Niels Bohr, and Planck.Second row -- Billiard Ball Model, Plum Pudding Model, Nuclear Model, Planetary Model, and the Quantum Mechanical Model.


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