Question

$NaCl$ is an ionic compound whereas $CuCl$ is a covalent compound. Explain the reason.

Answer 1

$NaCl$ is ionic and $CuCl$ is covalent. This covalent character increases as difference in electronegativity between the two atoms decreases.

$NaCl$ is ionic due to presence of positive charge on $N{a}^{+}$ and negative charge on $C{l}^{-}$ which cause attractive force between them and formation of the ionic bond between two ions.

$CuCl$ is more covalent than $NaCl$ because $Cu$ has same size as that of $Na$ and $CuCl$ has pseudo noble gas configuration due to which it has $18$ electrons in outermost shell than $NaCl$ which has $8$ electrons.