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(A) The melting point of Group $13$ elements is influenced by their crystal structure and bonding strength. Boron $(B)$ has an exceptionally high melt

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Boron

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(A) The melting point of Group $13$ elements is influenced by their crystal structure and bonding strength. Boron $(B)$ has an exceptionally high melting point of approximately $2450 \ K$ due to its strong covalent network structure. In contrast,other elements in the group like Aluminium $(Al)$,Gallium $(Ga)$,and Thallium $(Tl)$ have significantly lower melting points due to their metallic bonding. Therefore,Boron has the highest melting point among the given elements.

List-$I$	List-$II$
$A$. Melting point $[K]$	$I$. $Tl > In > Ga > Al > B$
$B$. Ionic Radius $[M^{+3} / pm]$	$II$. $B > Tl > Al \approx Ga > In$
$C$. $\Delta_{i} H_1 [kJ \ mol^{-1}]$	$III$. $Tl > In > Al > Ga > B$
$D$. Atomic Radius $[pm]$	$IV$. $B > Al > Tl > In > Ga$

Which of the following elements has the highest melting point?

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