Electron Discovery and Atomic Theories

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What is the concept of 'atomos'?

Back

The term 'atomos' means 'indivisible' and refers to the idea that matter can be divided only to a certain point, beyond which it cannot be divided further. This concept was introduced by Democritus.

Front

Who proposed the first atomic theory?

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John Dalton proposed the first atomic theory, which stated that all matter is made up of atoms, which are indivisible and indestructible.

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What is the Plum Pudding Model?

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The Plum Pudding Model, proposed by J.J. Thomson, describes the atom as a sphere of positive charge with negatively charged electrons embedded within it, resembling a 'plum pudding'.

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What did Rutherford's gold foil experiment demonstrate?

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

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What is the significance of the Bohr model?

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The Bohr model introduced the idea that electrons travel in fixed orbits around the nucleus and that energy levels are quantized.

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How does the Schrodinger model differ from the Bohr model?

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The Schrodinger model suggests that electrons do not travel in fixed orbits but rather exist in probabilistic clouds or orbitals around the nucleus.

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What are electrons?

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Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

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What is the charge of a proton?

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A proton has a positive charge.

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What is the charge of a neutron?

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A neutron has no charge; it is neutral.

Front

What is the nucleus of an atom?

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The nucleus is the central part of an atom, containing protons and neutrons, and is positively charged.