Usually means: Element with 84 protons: Polonium.
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We found 7 dictionaries that define the word atomic number 84:

General (6 matching dictionaries)
  1. atomic number 84: Vocabulary.com
  2. atomic number 84: Dictionary.com
  3. Atomic number 84: Rhymezone
  4. atomic number 84: FreeDictionary.org
  5. atomic number 84: Mnemonic Dictionary
  6. atomic number 84: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 84: Encyclopedia

Definitions from WordNet (Atomic number 84)

noun:  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


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