2.2 Atomic Theory History Review

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What is the Plum Pudding Model?

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A model proposed by J.J. Thomson that describes the atom as a sphere of positive charge with negatively charged electrons embedded within it.

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Who proposed the discovery of the nucleus?

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Ernest Rutherford is credited with proposing the discovery of the nucleus through his gold foil experiment.

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What is John Dalton's atomic theory?

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John Dalton proposed that atoms are small, dense, solid spheres that combine in fixed ratios to form compounds.

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Who discovered the electron?

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J.J. Thomson is known for discovering the electron through his cathode ray experiments.

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What is the Planetary Model of the atom?

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The Planetary Model, proposed by Niels Bohr, describes electrons orbiting the nucleus in defined paths, similar to planets orbiting the sun.

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What did Democritus contribute to atomic theory?

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Democritus was one of the first to propose that matter is made up of small, indivisible particles called atoms.

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What is the significance of Ernest Rutherford's gold foil experiment?

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Rutherford's experiment demonstrated that atoms have a small, dense nucleus, leading to the nuclear model of the atom.

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How did J.J. Thomson's model differ from Dalton's model?

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Thomson's model included electrons and proposed that atoms are not solid spheres, while Dalton's model depicted atoms as indivisible solid spheres.

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What is the main idea of Niels Bohr's model?

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Bohr's model introduced quantized energy levels for electrons, suggesting that they can only occupy certain orbits around the nucleus.

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What is the role of electrons in an atom?

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Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding and reactions.