The History of Atomic Theory by Kimberly Minerva https://padlet.com/kbruno1211/yltmz7rf793r From Humble Beginnings to Modern Understandings en-us 2019-02-07 13:31:51 UTC 2025-06-03 13:23:47 UTC hello@padlet.com https://www.thenakedscientists.com/sites/default/files/media/xATOM-CARTOON.jpg.pagespeed.ic.rT7VvGcsHL.jpg Watch This! kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500431268 Learn more about the scientists who contributed to our modern understanding of the atom by watching this video.]]> 2023-03-02 02:24:41 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500431268 300 BC-Early 1800s: Aristotle kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500436646 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!]]> 2023-03-02 02:29:42 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500436646 440 BC: Democritus kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500442175 •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”
]]> 2023-03-02 02:35:28 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500442175 1803: John Dalton kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500447388 • 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
]]> 2023-03-02 02:40:54 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500447388 1897: J.J. Thompson: The Plum Pudding Model kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500450106 • 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
]]> 2023-03-02 02:43:30 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500450106 Thomson's Cathode Ray Tube kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500452004 Watch this Video to learn how Thomson used a cathode ray tube to discover the electron!]]> 2023-03-02 02:45:22 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500452004 1911: Ernest Rutherford kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500455630 •Gold Foil Experiment
•An atom is a small dense positive nucleus surrounded by mostly empty space where electrons can be found
]]> 2023-03-02 02:48:27 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500455630 Rutherford's Famous Gold Foil Experiment kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500459127 2023-03-02 02:51:48 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500459127 1913: Niels Bohr kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500461293 •“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)
]]> 2023-03-02 02:53:56 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500461293 Modern Model: Electron-Cloud Model or Wave-Mechanical Model kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500466947 • 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.
]]> 2023-03-02 02:59:36 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500466947 Atomic History Kahoot! kbruno1211 https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500469375 Test your new knowledge by playing this Kahoot!]]> 2023-03-02 03:02:04 UTC https://padlet.com/kbruno1211/yltmz7rf793r/wish/2500469375