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Definition
| The mass of an element's atoms listed in the Periodic Table as an average value based on the relative abundance of the element's isotopes. |
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Definition
| The dense, positively charged center of every atom. |
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Definition
| An abbreviation for an element or atom. |
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Term
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Definition
| An extremely small, negatively charged subatomic particle found outside the atomic nucleus. |
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Term
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Definition
| Any material that is made up of only one type of atom. |
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Definition
| Any members of a set of atoms of the same element whose nuclei contains the same number of protons but different numbers of neutrons. |
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Definition
| Any electrically neutral subatomic particle of the atomic nucleus. |
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Definition
| Any subatomic particle found in the atomic nucleus; another name for either proton or neutron. |
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Definition
| A chart in which all known elements are listed in order of atomic number. |
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Term
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Definition
| A positively charged subatomic particle fo the atomic nucleus. |
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