Which is the longest lived isotope of Francium?

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${Fr}^{225}$

${Fr}^{224}$

${Fr}^{222}$

${Fr}^{223}$

answer is A.

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Detailed Solution

The chemical element francium has the atomic number 87 and the symbol Fr. It is highly radioactive; the half-life of its most stable isotope, francium-223, which was formerly known as actinium K after the natural decay chain it appears in, is just 22 minutes.

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