Could you think of another pure component (one element) rather than carbon which exist as a conductor, a semiconductor, and an insulator based only on its structure and size?
The solution to this problem lies in the trends of the periodic table. If we look closely at the transition between metals and non-metals we can see a crossover in terms of electronic properties for the elements. These elements present at the border are also referred to as metalloids. Elements in this classifications can exist in multiple allotropic forms that can be conductors, semiconductors and insulators.
These elements other than carbon namely are Tin (Sn) and Arsenic (As).
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