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1. Atoms are small hard particles

2. Uncut able

3. Atoms constantly move.

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1. All substances are made of atoms

2. Atoms of different elements are different

3. He conducted experiments in combining elements

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1. “Plum” pudding or chocolate chip model

2. Small negatively (-) charges particles in the atom
3. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.

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1. Most of the atom’s mass is in the nucleus

2. Small dense positively charged nucleus

3. Atoms contain mostly empty space

4. Electrons move in the empty space of the atoms

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1. Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values.
2. Electrons travel in definite paths

3. Electrons ‘jump’ between levels from path to path

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1. Electron paths cannot be predicted

2. Electrons are found in electron clouds.
3. They mathematically determined regions in which electrons would be most likely found.