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The isotopes of an element have different numbers of ____.
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atoms
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A water molecule (H2O) has one oxygen and two hydrogen ____.
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elements
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At STP, equal volumes of gases have an equal number of ____.
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isotopes
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Na and Cl are the ____ for sodium and chlorine.
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mixtures
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C-12 and C-14 are ____ of carbon atoms. Each has six protons.
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molecules
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Heterogeneous ____ can be separated by physical means.
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neutrons
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All atoms of an element have the same number of ____.
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protons
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A spoonful of table salt (NaCl) is composed of two ____.
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symbols
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