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

⭐️ https://www.cognito.org/ ⭐️ ** 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 **    • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • Alevel Biology   #GCSE #Chemistry #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE