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Chapter 3 Vocabulary

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Across
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Matter is neither created nor destroyed
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Number of particles in exactly one mole of a pure substance
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A chemical compound contains the same elements in exactly the same proportions by mass regardless the size of the sample or source of compound
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Total number of protons and neutrons that make up the nucleus of an isotope
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Smallest particle of an element
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Atoms of the same element that have different masses
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Short range proton-neutron, proton-proton, and neutron-neutron forces that hold the nuclear particles together
Down
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If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
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Weighted average of the atomic masses of the naturally occurring isotopes of an element
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Specific isotope of an element
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Exactly 1/12 the mass of a carbon-12 atom
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Number of protons of each atom of that element
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Mass of one mole of a pure substance
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Amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12