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Definition
| The smallest particle of an element that can exist by itself. |
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Definition
| The average mass of the atoms of an element. |
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Definition
| The number of protons in the nucleus of an element; each element has a unique number. |
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Definition
| A group of elements that have a characteristic set of common physical and chemical properties. |
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Definition
| A property that describes a possible chemical change that a substance may undergo (e.g., reacts with water). |
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Definition
| A negatively charged subatomic particle located outside the nucleus of an atom; has an electric charge of -1. |
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Definition
| A specific region around the nucleus in which electrons are arranged; also called an orbital or an energy level. |
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Definition
| A substance that cannot be broken down into simpler materials. |
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Definition
| The total number of protons and neutrons in the nucleus of an atom. |
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Definition
| Formed when two or more substances are put together but are not chemically combined. |
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