HChem, Unit 2 Vocabulary

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Atomic theory

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A scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms.

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Atom

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The smallest unit of ordinary matter that forms a chemical element.

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Element

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A substance that cannot be broken down into simpler substances by chemical means.

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John Dalton

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An English chemist, physicist, and meteorologist who is best known for introducing the atomic theory into chemistry.

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JJ Thomson

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A physicist who discovered the electron and proposed the plum pudding model of the atom.

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Thomson Cathode Ray

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Experiments conducted by JJ Thomson that led to the discovery of the electron.

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Ernest Rutherford

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A physicist who discovered the nucleus of the atom through the gold foil experiment.

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Gold foil experiment

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An experiment conducted by Ernest Rutherford that led to the discovery of the atomic nucleus.

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Neils Bohr

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A physicist who made foundational contributions to understanding atomic structure and quantum theory.

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Schroedinger

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A physicist who developed the Schrödinger equation, a key result in quantum mechanics.