protoactinium
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Definition Noun : A short-lived, radioactive, metallic chemical element. It is formed from the decay of uranium and itself decays into actinium and then ultimately into lead. It is a dense, silvery-gray metal that is highly toxic due to its radioactivity. Usage "Protoactinium" is the original name for the element now more commonly known as "protactinium." It is used primarily in scientific, his...
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