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Questions  

A, B, C, D and E are the elements belonging to 13th 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

a
Al
b
B
c
In
d
Ga

detailed solution

Correct option is A

Atomic radius….BTl>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…BTl>In>Ga>Al;

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