First slide

Atomic and physical properties

Question

Correct decreasing order of melting points in 13th group elements is

Easy

A

B > Al > Ga > In > Tl
B

B > Al > Tl > In > Ga
C

B > In > Al > Tl > Ga
D

Al > B > In > Tl > Ga

Solution

Boron - Giant Polymer - High m.p
Gallium - Discrete diatomic molecule - Low m.p ;
B > Al > Tl > In > Ga.

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