Atomic History (Scientists)

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What is Dalton's Model of the atom?

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Dalton's Model describes the atom as a solid sphere that is indivisible and indestructible, proposing that all matter is made up of atoms.

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What does the term 'atomos' mean?

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The term 'atomos' is Greek for 'uncut' or 'indivisible', referring to the smallest particles that Democritus believed made up all matter.

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What was Niels Bohr's contribution to atomic theory?

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Niels Bohr created a model of the atom where electrons move around the nucleus in fixed orbits, introducing the concept of quantized energy levels.

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Which atomic model was developed after the discovery of the nucleus?

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Rutherford's model was developed after the discovery of the nucleus, proposing that atoms have a dense central nucleus surrounded by electrons.

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Which scientist proposed that atoms are solid spheres?

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John Dalton proposed that atoms are solid spheres in his atomic theory.

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What is the Plum Pudding Model?

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The Plum Pudding Model, proposed by J.J. Thomson, suggests that atoms are composed of a positively charged 'soup' with negatively charged electrons embedded within it.

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Who discovered the electron?

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J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays.

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What did Ernest Rutherford's gold foil experiment demonstrate?

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

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What is the Quantum Mechanical Model of the atom?

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The Quantum Mechanical Model describes electrons as existing in probabilistic orbitals rather than fixed orbits, incorporating principles of quantum mechanics.

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What did Democritus contribute to atomic theory?

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Democritus is credited with the early idea that matter is composed of small, indivisible particles called atoms.