Mon October 10, 2011 By: Aakrati

All the elements of nitrogen family show allotropy except bismuith.why?

Expert Reply
Tue October 11, 2011

Except for bismuth, all the other elements exist in two or more allotropic forms. The reason is the size of the bismuth. Bismuth has the largest covalent radius in the group and hence can only form 3 single covalent bonds instead of 5 or more because of inert pair effect and therefore it can not exist in different allotropic forms.

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