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

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

  1. A

    Al

  2. B

    Tl

  3. C

    In

  4. D

    Ga

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    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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