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Atomos:
All matter around us is made of indivisible tiny particles

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Dalton's Atomic Theory:

1. Elements are made up of tiny particles called atoms
2. Atoms of one element are identical while atoms of different elements are different
3. Conservation of atomsrearrangement in RXN
4. Different atoms form compounds in constant ratios

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The structure of atoms is somehow related to electricity

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Discovered that atoms have negative particles using a cathode ray tube
Electrons are dispersed in a uniform positive charge

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Measured the charge of an electron using oil droplets

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Rutherfords Nucleus Theory:
Positive charge is not like a pudding, but concentrated in the nucleus as shown in the Gold Foil experiment

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Moseley's Atomic #:
Each element contains a unique number of protons

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Bohr's Orbit Model:
Electrons orbit the nucleas
Energy is quantized

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Wave Mechanical Model:
Electrons can act like particles and waves
Electrons occupy orbitals. Orbitals are nothing like orbit, they are simply areas of probability