PSChem 1 Vocabulary

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Protons

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Positively charged particles found in the nucleus of an atom.

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Neutrons

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Neutral particles found in the nucleus of an atom.

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Electrons

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Negatively charged particles that orbit the nucleus of an atom.

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Atomic Mass

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The mass of an atom, typically expressed in atomic mass units (amu), approximately equivalent to the number of protons and neutrons in the atom.

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Atomic Number

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The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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Isotope

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Atoms of the same element with the same number of protons but different numbers of neutrons.

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Rutherford

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Ernest Rutherford, a physicist who discovered the nucleus of the atom and proposed the nuclear model of the atom.

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Bohr

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Niels Bohr, a physicist who developed the Bohr model of the atom, introducing the idea of quantized energy levels for electrons.

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Electron Cloud

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A region around the nucleus of an atom where electrons are likely to be found.

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Nucleus

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The central part of an atom, containing protons and neutrons.