First slide

Atomic and physical properties

Question

The correct order of melting points of IIIA group elements is

Moderate

A

B > Al > Tl > In > Ga
B

B > Al > Ga > In > Tl
C

B > Al > Tl > Ga > In
D

B > Al > In > Tl > Ga

Solution

→ The melting point of Boron is very high because of its gaint covalent polymeric structure.
→The low melting point of Gallium is due to Gallium consists f discrete diatomic molcules which are held by weak Vander waals forces of attractions.
Melting point order: B > Al >Tl >In > Ga.

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