History of Atomic Theory

Front

What is the Plum Pudding model of the atom?

Back

A model proposed by J.J. Thomson, suggesting that the atom is a positively charged sphere with negatively charged electrons embedded within it.

Front

Who proposed the idea that atoms are indivisible solid spheres?

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John Dalton proposed that atoms are tiny, indivisible solid spheres, similar to balls or marbles.

Front

What did James Chadwick discover?

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James Chadwick discovered the neutron, a subatomic particle found in the nucleus of an atom.

Front

Describe Ernest Rutherford's model of the atom.

Back

Rutherford's model proposed that atoms have a small, dense nucleus surrounded by orbiting electrons, leading to the nuclear model of the atom.

Front

What is the significance of J.J. Thomson's experiments with cathode rays?

Back

Thomson's experiments led to the discovery of the electron and the development of the Plum Pudding model.

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What did Niels Bohr contribute to atomic theory?

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Niels Bohr proposed that electrons orbit the nucleus in fixed paths or energy levels, introducing the concept of quantized energy levels.

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What is Dalton's Atomic Theory?

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Dalton's Atomic Theory states that all matter is made of atoms, which are indivisible and indestructible, and that atoms of the same element are identical.

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How did Rutherford's gold foil experiment change the understanding of the atom?

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Rutherford's gold foil experiment showed that atoms have a dense nucleus, leading to the rejection of the Plum Pudding model.

Front

What is the main idea of the Bohr model of the atom?

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The Bohr model suggests that electrons travel in fixed orbits around the nucleus and can jump between these orbits by absorbing or emitting energy.

Front

What is the role of neutrons in an atom?

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Neutrons are neutral particles found in the nucleus of an atom, contributing to the atomic mass and stability of the nucleus.