First slide

Atomic and physical properties

Question

Which of the following graph represents the order among the melting points of IIIA group elements

Moderate

A
B
C
D

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 consistsof 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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