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
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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For example, in the A-B intraverbal, the antecedent stimuli were, "Name the boron [-group] element" and the correct response was "indium"; in the B-C intraverbal, the antecedent stimuli were "Name the atomic number of the indium" and the correct response was "49." The other two A-B and B-C intraverbals were analogous, referred to the chalcogen group, polonium, and the atomic number 84. For clarity purposes, we denominated the four A-B and B-C intraverbals as the taught intraverbals.