A) an increase from\[{{N}^{3-}}\]to\[{{F}^{-}}\]and then decrease from\[N{{a}^{+}}\]to\[M{{g}^{2+}}\]
B) a decrease from\[{{N}^{3-}}\]to\[{{F}^{-}}\]and then increase from\[N{{a}^{+}}\]to\[M{{g}^{2+}}\]
C) a significant increase from\[{{N}^{3-}}\]to\[M{{g}^{2+}}\]
D) a significant decrease from\[{{N}^{3-}}\]to\[M{{g}^{2+}}\]
Correct Answer: D
Solution :
Ionic radii \[\propto \frac{1}{effective\text{ }nuclear\text{ }ch\arg e({{Z}_{eff}})}\] \[\propto negative\text{ }charge\] \[\propto \frac{1}{positive\text{ }charge}\] Hence, as the negative charge increases, ionic radii increases and with increase in positive charge ionic radii decrease. Hence, ionic radii decreases from\[{{N}^{3-}}\]to\[M{{g}^{2+}}\]
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