francium /fran·ci·um/ (Fr) (fran´se-um) a chemical element, at. no. 87.
francium (Fr)
fran·ci·um (fr n s - m)n. Symbol Fr An extremely unstable radioactive element of the alkali metals, having approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87. |
francium (Fr)
[fran′sē·əm]
Etymology: France
a metallic element of the alkali metal group. Its atomic number is 87, and the mass of its longest-lived isotope is 223. Formed from the decay of actinium, all of its 20 isotopes are radioactive and short-lived.
francium
a chemical element, atomic number 87, atomic weight 223, symbol Fr. See Table 6.
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