Developing the Model of the Atom

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10 Terms

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Thomson

suggested atoms were spheres of positive charge with tiny negative electrons stuck in them like fruit in a plum pudding- the plum pudding model.

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Niels Bohr

said that electrons orbiting the nucleus do so at certain distances called energy levels.

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Rutherford

replaced the plum pudding model with the nuclear model.

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1804

In , John Dalton agreed with Democritus that matter was made up of tiny spheres that couldnt be broken up, but he reckoned that each element was made up of a different type of atom.

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nuclear model

The that resulted from the alpha particle scattering experiment was a positively charged nucleus surrounded by a cloud of negative electrons.

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overall positive charge

It has an

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protons and neutrons

The nucleus contains_

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empty space

The rest of the atom is

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negative electrons

move around the outside

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number of neutrons

Number of protons=_