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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 86, atomic number 87, atomic number 88, atomic number 89 | ||
| Definition: | [n] a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium | ||
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| Synonyms: | astatine, At | ||
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| See Also: | chemical element, element, halogen | ||
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