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| Anything that has mass and occupies space. |
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| A substance that cannot be broken down into any other substances by chemical or physical means. |
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| A substance made of two or more elements chemically combined in a specific ratio, or proportion. |
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| Two or more substances that are mixed together but not chemically combined. |
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| The smallest particle of an element. |
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| A well-tested idea that explains and connects a wide range of observations. |
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| Physical, mental, visual, and other representations of an idea to help people understand a concept that they cannot observe directly. |
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| Negatively charged particles that move around outside the nucleus of an atom. |
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| The central core of the atom, containing protons and usually neutrons. |
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| Small, positively charged particles that are found in the nucleus of an atom. |
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| The specific amount of energy an electron has. |
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| Small, uncharged particles that are found in the nucleus of an atom. |
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| The electrons that are in the highest energy level of an atom and that are involved in chemical reactions. |
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| A representation of the valence electrons in an atom, using dots. |
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| The force that holds atoms together. |
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| A one- or two letter set of characters that is used to identify an element. |
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| The number of protons in the nucleus of an atom. |
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Definition
| Elements in the same horizontal row of the periodic table. |
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| Elements in the same vertical column of the periodic table; also called a family. |
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| Elements in the smae vertical column of the periodic table; also called a group. |
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| An element of Group 18 of the periodic table. |
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| An element belonging to group 17 of the periodic table. |
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| An element belonging to Group 1 of the periodic table. |
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