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Definitions of francium
  1. noun
    a radioactive element of the alkali-metal group discovered as a disintegration product of actinium

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Definition that contains francium
  • alkali metal any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)
  • alkaline metal any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)
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