: a short-lived radioactive element of the alkali-metal group occurring naturally as a disintegration product of actinium and also produced artificially — see Chemical Elements Table
Examples of francium in a Sentence
Recent Examples on the WebPerey, being French, decided to call it francium instead.
Neima Jahromi, The New Yorker, 27 Dec. 2019
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: a radioactive element of the alkali-metal group discovered as a disintegration product of actinium and obtained artificially by the bombardment of thorium with protons—symbol Fr — see Chemical Elements Table