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THE STRUCTURE OF AN ATOM
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THE STRUCTURE OF AN ATOM
Matter is anything that occupies space and has mass
The Atomic Structure
- John Dalton
- Proposed the Atomic Model
- J.J Thomson
- Discovered Electron,a -ve particle
- Ernest Rutherford
- Proton,+ve & Nucleus in centre
- Niels Bohr
- Electrons move in shell and the orbit
- James Chadwick
- Proved existence of neutrons,nucleus contain proton and electron& nucleus is 1/2 mass of atom
- John Dalton
Isotopes
- Cobalt-60 for Cancer
- Carbon-14 for age of fossils
- Sodium-24 for oil leaks
Diffusion occurs when the particles of a substance move between the particles of another substance from a region of high concentration to low concentration
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