My book says it has something to do with the inert pair effect. And unlike As, Sb and Bi tend to form 3 covalent bonds rather than 5. I don't understand what's really going on here.
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see this:http://chemistry.stackexchange.com/questions/33815/trend-in-the-melting-point-down-the-group – Nilay Ghosh Sep 24 '16 at 11:41