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(A) The ionic radius is inversely proportional to the $Z/e$ ratio (where $Z$ is the nuclear charge and $e$ is the number of electrons).For the given i

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$O^{2-}$

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(A) The ionic radius is inversely proportional to the $Z/e$ ratio (where $Z$ is the nuclear charge and $e$ is the number of electrons).For the given ions:$O^{2-}$: $Z=8, e=10$,$Z/e = 0.8$$F^{-}$: $Z=9, e=10$,$Z/e = 0.9$$Li^{+}$: $Z=3, e=2$,$Z/e = 1.5$$B^{3+}$: $Z=5, e=2$,$Z/e = 2.5$Since $O^{2-}$ has the lowest $Z/e$ ratio,it has the largest ionic radius.

Which one of the following ions has the highest value of ionic radius?

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