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| Smallest unit of matter that can retain the element's properties. Tiny building blocks of matter; composed of protons, neutrons and electrons. |
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| Positively-charged particle in the nucleus of an atom; correlates to the atomic number. |
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| The number of protons in an atom. |
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| Matter that is made of two or more elements and has physical and chemical properties different from each of the elements that make it up. |
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| A physical property of matter that can be determined by dividing the mass of an object by its volume. |
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| Negatively-charged particles that move around the nucleus of an atom and form an electron cloud. |
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| Substance that contains only one type of atom and cannot be broken down by normal chemical or physical means - for example, oxygen, aluminum or iron. |
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| Mixtures which are not mixed evely and each component retains its own properties. |
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| Mixtures which are evenly mixed throughout; aka "solutions" |
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| Electrically-charged atom whose charge results from an atom losing or gaining electrons. |
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| Atoms of the same element that have different numbers of neutrons. |
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| The number of protons plus neutrons in the nucleus of an atom. |
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| Anything that has mass and takes up space; matter's properties are determined by the structure of its atoms and how they are joined. |
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| A combination of substances in which the individual substances do not change or combine chemically but instead retain their own individual properties; can be gases, liquids, solicds, plasma, or any combination of these. |
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| Particle without an electrical charge that is located in the nucleus of an atom. |
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| A kind of mixture in which one substance is completely and evenly mixed in another substance and is the same throughout. |
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