Definition of atomic number 91
English to English noun - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
source: WordNet 3.0
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atomic number 91, atomic number 9, atomic number 1, atomic number 69, atomic number 39, atomic number 21, atomic number 90, atomic number 41, atomic number 14, atomic number 96, atomic number 61, atomic number 71, atomic number 17, atomic number 81, atomic number 11, atomic number 16, atomic number 99, atomic number 89, atomic number 29, atomic number 31
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