Usually means: Atomic number of europium element.
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We found 7 dictionaries that define the word atomic number 63:

General (6 matching dictionaries)
  1. atomic number 63: Vocabulary.com
  2. atomic number 63: Dictionary.com
  3. Atomic number 63: Rhymezone
  4. atomic number 63: FreeDictionary.org
  5. atomic number 63: Mnemonic Dictionary
  6. atomic number 63: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 63: Encyclopedia

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Definitions from WordNet (Atomic number 63)

▸ noun:  a bivalent and trivalent metallic element of the rare earth group


Opposite:
europium, element 63, atomic number 61, atomic number 62, atomic number 64

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Similar:

Opposite:
europium, element 63, atomic number 61, atomic number 62, atomic number 64




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