Which of the following has the lowest ionic c | vedclass

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(C) According to Fajan's rule,the ionic character decreases as the covalent character increases. Covalent character increases with the polarising powe

Vedclass · Accepted Answer

$CdCl_2$

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(C) According to Fajan's rule,the ionic character decreases as the covalent character increases. Covalent character increases with the polarising power of the cation. Polarising power is directly proportional to the charge density (charge/size ratio) and is also influenced by the electronic configuration of the cation. Cations with a pseudo-noble gas configuration $(ns^2 np^6 nd^{10})$ have a higher polarising power than those with a noble gas configuration $(ns^2 np^6)$. Among the given options,$Mg^{2+}$ has a noble gas configuration $([Ne])$,while $Fe^{2+}$,$Zn^{2+}$,and $Cd^{2+}$ have different configurations. $Cd^{2+}$ has a larger size compared to $Zn^{2+}$,but it has a $4d^{10}$ configuration which is highly polarising. Comparing $FeCl_2$,$ZnCl_2$,$CdCl_2$,and $MgCl_2$,$CdCl_2$ exhibits the highest covalent character due to the high polarising power of the $Cd^{2+}$ ion (pseudo-noble gas configuration and larger size compared to $Zn^{2+}$),thus it has the lowest ionic character.

Which of the following has the lowest ionic character?

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