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Atomic Radius

K+ and F- h...

Question

$K^{+}$ and $F^{-}$ have identical radius about $1.34 ˚ A$ . What should be the atomic radius of $K$ and $F$ atoms?

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Solution

In any atom if a electron is lost to become a cation, the ionic radius decreases.
$∴$ Ionic radius of $K^{+} <$ radius of $K$ .
If an atom gains an electron to become an anion, its ionic radius increases,
$∴$ Ionic radius of $F^{-} >$ radius of $F .$

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