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| Matching Terms: | atomic number 8, atomic number 80, atomic number 81, atomic number 82, atomic number 83, atomic number 84, atomic number 85, atomic number 86, atomic number 87, atomic number 88 | ||
| Definition: | [n] a radioactive element of the actinide series; found in uranium ores | ||
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| Synonyms: | Ac, actinium | ||
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| See Also: | chemical element, element, uranium ore | ||
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