What is the correct order of melting points f | vedclass

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(C) The melting points of Group $13$ elements do not show a regular trend due to the differences in their crystal structures and atomic sizes. $B$ (Bo

Vedclass · Accepted Answer

$B > Al > Tl > In > Ga$

Vedclass · Answer

(C) The melting points of Group $13$ elements do not show a regular trend due to the differences in their crystal structures and atomic sizes. $B$ (Boron) has a very high melting point due to its strong covalent network structure. $Al$ (Aluminum) has a lower melting point than $B$. $Ga$ (Gallium) has an unusually low melting point $(303 \ K)$ because it exists as $Ga_2$ molecules in the solid state. $In$ (Indium) and $Tl$ (Thallium) follow,with $Tl$ having a higher melting point than $In$ due to the inert pair effect and relativistic effects. The correct order is $B > Al > Tl > In > Ga$.

What is the correct order of melting points for the elements of Group $13$?

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