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Atoms
Term | Definition |
---|---|
Atom | basic unit of matter |
Dalton (1802) | tiny, indestructible particle |
Thomson (1897) | atoms contain electrons; plum-pudding model |
Rutherford (1911) | nucleus contains protons, electrons orbit nucleus |
Electron Cloud Model (1926) | electrons are very small and very fast; water sprinkler example |
Chadwick (1932) | nucleus also contains neutrons (particle with no charge) |
Proton | positively charged particle - in nucleus |
Neutron | particle with no charge - in nucleus |
Electron | negatively charged particle - moving around nucleus |
Thomson's experiment | Cathode ray tube |
Rutherford's experiment | Gold foil |
Nucleus | contains protons + neutrons |