Francium

2 definitions found

From WordNet (r) 2.0 [wn]:

  francium
       n : a radioactive element of the alkali-metal group discovered
           as a disintegration product of actinium [syn: {Fr}, {atomic
           number 87}]

From Elements database 20001107 [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.