Usually means: Element with 87 protons: Francium.
Definitions Related words Mentions
We found 7 dictionaries that define the word atomic number 87:

General (6 matching dictionaries)
  1. atomic number 87: Vocabulary.com
  2. atomic number 87: Dictionary.com
  3. Atomic number 87: Rhymezone
  4. atomic number 87: FreeDictionary.org
  5. atomic number 87: Mnemonic Dictionary
  6. atomic number 87: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 87: Encyclopedia

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Definitions from WordNet (Atomic number 87)

▸ noun:  a radioactive element of the alkali-metal group discovered as a disintegration product of actinium


Opposite:
francium, metal

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Opposite:
francium, metal




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