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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$\begingroup$ see this:chemistry.stackexchange.com/questions/33815/… $\endgroup$ – Nilay Ghosh Sep 24 '16 at 11:41
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