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francium
(redirected from Actinium K)

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francium /fran·ci·um/ (Fr) (fran´se-um) a chemical element, at. no. 87.

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

a chemical element, atomic number 87, atomic weight 223, symbol Fr. See Table 6.

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