BeCl_2 is covalent while MgCl_2 is ionic. - Vidyadip

Question

$BeCl_2$ is covalent while $MgCl_2$ is ionic.

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Answer

$Be^{2+}$ ion has very small ionic size and therefore, it has very high charge density.
Due to this, it has high tendency to distort the electron cloud around the negatively charged chloride ion $(Cl^–)$ which is larger in size.
This results in partial covalent character of the bond in $BeCl_2.$
$Mg^{2+}$ ion has very less tendency to distort the electron cloud of $Cl^–$ due to the bigger size of $Mg^{2+}$ as compared to $Be^{2+}.$

Hence, $BeCl_2$ is covalent while $MgCl_2$ is ionic.

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