Usually means: Element with 99 protons: Einsteinium.
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We found 7 dictionaries that define the word atomic number 99:

General (6 matching dictionaries)
  1. atomic number 99: Vocabulary.com
  2. atomic number 99: Dictionary.com
  3. Atomic number 99: Rhymezone
  4. atomic number 99: FreeDictionary.org
  5. atomic number 99: Mnemonic Dictionary
  6. atomic number 99: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 99: Encyclopedia

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Definitions from WordNet (Atomic number 99)

▸ noun:  a radioactive transuranic element produced by bombarding plutonium with neutrons


Opposite:
Einsteinium, Es

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Opposite:
Einsteinium, Es




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