Question

Why does the melting point in group 15 increase upto arsenic and then decrease upto bismarck

Answer 1

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As we move down the group no.of shells increases so the energy to release the electrons also increase (size is directly proportional to the Vander walls forces ) as we move down the group size increases so Vander walls force also increases therefore we have to boil it for a long time at a high temperature to break the forces and release electrons.