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An unstable radioactive element that exists only in the form of radioactive isotopes. The longest-lived isotope of francium has a half-life of 21 minutes. Francium was first isolated from uranium ore in 1939. Francium is used in medical studies and cancer diagnostics.

Synonyms and Related Terms


Composition Fr (atomic no. 87)
Melting Point 20
Density 2.4
Molecular Weight atomic wt=223
Boiling Point 640

Sources Checked for Data in Record

  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4268
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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