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| un·un·pen·ti·um [ ùn un péntee əm ] |
noun |
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| Definition: |
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artificially produced chemical element: a highly unstable radioactive chemical element with an atomic number of 115, reported to have been produced artificially by bombarding americium with calcium atoms.
Symbol Uup
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| [Late 20th century. < Latin unus "one" (repeated) + Greek pente "five," representing 115, its atomic number] |
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