Atomic Theory Flashcards

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Atomic Theory

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Explanation of matter as composed of discrete units called atoms.

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Atom

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Smallest unit of an element, retaining chemical properties.

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John Dalton

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Proposed the first modern atomic theory in the early 19th century.

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Dalton's Atomic Theory

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Atoms are indivisible, identical in an element, and combine in fixed ratios.

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J.J. Thomson

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Discovered the electron using the cathode ray tube experiment.

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Plum Pudding Model

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Thomson's model of the atom with electrons in a positive 'soup.'

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Ernest Rutherford

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Discovered the nucleus through the gold foil experiment.

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Rutherford Model

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Atom with a dense nucleus and electrons orbiting around it.

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Niels Bohr

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Proposed quantized electron orbits in the hydrogen atom.

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Bohr Model

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Electrons orbit the nucleus in fixed energy levels.