SCIENCE FLASHCARDS

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BOHRS MODEL

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Bohr theory modified the atomic structure model by explaining that electrons move in fixed orbitals (shells) and not anywhere in between and he also explained that each orbit (shell) has a fixed energy.

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MODERN ATOMIC THEORY

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Modern atomic theory states that all matter is composed of tiny, indivisible particles called atoms, where atoms of the same element are identical, atoms of different elements have different properties, and atoms combine in whole number ratios to form compounds

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ATOM

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the basic building block of chemistry

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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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PROTON

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POSITIVELY CHARGED PARTICLES

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NEUTRON

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UNCHARGED PARTICLES

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ELECTRON

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NEGATIVELY CHARGED PARTICLES THAT MOVE AROUND THE OUTSIDE OF THE NUCLEUS

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ATOMIC NUMBER

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A NUMBER OF PROTONS IN THE NUCLEUS OF AN ATOM

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ATOMIC MASS

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THIS IS EQUAL TO THE NUMBER OF PROTONS AND NEUTRONS IN THE NUCLEUS

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ISOTOPE

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A form of a chemical element in which the atoms have the same number of protons (part of the nucleus of an atom) but with a different number of neutrons (part of the nucleus of an atom