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)|
|Molecular Weight||atomic wt=223|
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