Which is the longest lived isotope of Francium?
A. `Fr^(223)`
B. `Fr^(222)`
C. `Fr^(224)`
D. `Fr^(225)`
A. `Fr^(223)`
B. `Fr^(222)`
C. `Fr^(224)`
D. `Fr^(225)`
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Correct Answer – A
`Fr^(223)` has a half-life of only 21 minutes.