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The ions $O^{2-},F^{-},Na^{+},Mg^{2+}$ and $Al^{3+}$ are iso electronic, Their ionic radii show.

(a) An increase from $O^{2-}$ to $F^{-}$ and then decrease from $Na^+$ to $Al^{3+}$

(b) An decrease from $O^{2-}$ to $F^{-}$ and then increase from $Na^+$ to $Al^{3+}$

(c) An Significant increase $O^{2-}$ to $Al^{3+}$

(d) A significant decrease from $O^{2-} \; to \;Al^{3+} $

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The ions $O^{2-},F^{-},Na^{+},Mg^{2+}$ and $Al^{3+}$ are iso electronic, Their ionic radii show an Significant increase $O^{2-}$ to $Al^{3+}$
Hence c is the correct answer.
answered Mar 6, 2014 by meena.p
 

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