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Which order of radius is correct

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a

$N a^{+} > M g^{+ 2} > A l^{+ 3} > K^{+}$

b

$F^{-} > C l^{-} > B r^{-} > I^{-}$

c

$Z n > C d = H g$

d

$S c > T i > V > C r$

answer is B.

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