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francium n. 鈁 鈁 francium n 1: a radioactive element of the alkali-metal group discovered as a disintegration product of actinium [synonym: {francium}, {Fr}, {atomic number 87}] 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.
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