francium : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: francium	by the DICT Development Group
2 results for francium
From WordNet (r) 3.0 (2006) [wn]:
francium n a radioactive element of the alkali-metal group discovered as a disintegration product of actinium Synonym(s): francium, Fr, atomic number 87
From The Elements (22Oct97) [elements]:
francium Symbol: Fr Atomic number: 87 Atomic weight: (223) Radioactive element, belongs to group 1 of the periodic table. Found in uranium and thorium ores. The 22 known isotopes are all radioactive, with the most stable being Fr-223. Its existence was confirmed in 1939 by Marguerite Perey.