atomic number 84

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Noun1.atomic number 84 - a radioactive metallic element that is similar to tellurium and bismuthatomic number 84 - a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
Po, polonium
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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