GCSE Chemistry - The History of the Atom | Models & Theories

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*** WHAT'S COVERED ***
1. Evolution of Atomic Theory
* Ancient Greek ideas about atoms (Democritus).
* John Dalton's concept of atoms as solid spheres and the definition of elements.
2. Discovery of Subatomic Particles
* J.J. Thomson's experiments leading to the discovery of the electron and the Plum Pudding model.
* Ernest Rutherford's gold foil experiment, which revealed the existence of a small, dense nucleus.
3. Development of the Nuclear Model
* Rutherford's proposal of an atom with a positively charged nucleus at its centre, with electrons outside the nucleus.
* Niels Bohr's refinement of the model, suggesting electrons orbit the nucleus in specific energy shells.
4. Finalising the Modern Atomic Structure
* Rutherford's subsequent work identifying protons as the positively charged particles in the nucleus.
* James Chadwick's discovery of neutrons in the nucleus, completing the main components of the atom.

*** CHAPTERS ***
0:00 Introduction
0:25 Democritus: Early Atomic Ideas
0:54 John Dalton: Solid Sphere Model
1:16 J.J. Thomson: Plum Pudding Model
1:49 Ernest Rutherford: Nuclear Model
3:18 Niels Bohr: Electron Shell Model
4:03 Rutherford and Chadwick: Protons and Neutrons

*** PLAYLISTS ***






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