- 1. n. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead Source: wordnet
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atomic number 91
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atomicatomic bombatomic clockatomic cocktailatomic energyAtomic Energy Commissionatomic explosionatomic massatomic mass unitatomic numberatomic number 1atomic number 10atomic number 100atomic number 101atomic number 102
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