First slide

Atomic and physical properties

Question

A, B, C, D and E are the elements belonging to 13^th group of Modern periodic table. The correct atomic radius trend for these elements is A< B <C < D< E . The element ‘C' in the sequence is

Easy

A

Al
B

B
C

In
D

Ga

Solution

Atomic radius….B<Ga<Al<In<Tl;
IP₁…..B>Tl>Ga>Al>In;
MP…B>Al>Tl>In>Ga;
Boron has gaint polymeric structure,Gallium exists as Ga₂ molecule(M.P = 302 K)
BP….B>Al>Ga>In>Tl:
Difference in B.P and M.P in Gallium is about 2300 K. It has wide liquid range.It is athermometric liquid.
Density…B<Al<Ga<In<Tl;
EN…B>Tl>In>Ga>Al;

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