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Which one of the following compound contains a cation having non-inert gas outermost configuration?

$\begin{array}{1 1}(a)\;CaCl_2&(b)\; CuCl_2\\(c)\;NaCl&(d)\;KCl\end{array}$

1 Answer

$CaCl_2\rightarrow Ca^{2+}+2Cl^-;Ca^{2+}$(18 electrons);$1s^2(2s^22p^6)(3s^23p^6)$
$CuCl_2\rightarrow Cu^{2+}+2Cl^-;Ca^{2+}$(27 electrons);$1s^2(2s^22p^6)(3s^23p^63d^9)$
$NaCl\rightarrow Na^{+}+Cl^-;Na^{2+}$(10 electrons);$1s^2(2s^22p^6)$
$KCl\rightarrow K^{+}+2Cl^-;Cl^{-}$(18 electrons);$1s^2(2s^22p^6)(3s^23p^6)$
The cation in $CuCl_2$ is not having inert gas outer most configuration.
Hence (b) is the correct answer.
answered Mar 10, 2014 by sreemathi.v
 

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