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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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| a property that describes a possible chemical change that a substance may undergo (e.g., reacts with water) |
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Definition
| a substance formed from two or more elements, in which the elements are always combined in the same fixed proportions |
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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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