Why is diamond non-conductive to electrical current?

Answer 1

Well, there are no free electrons in the non-molecular diamond structure to carry a charge....

The carbon in diamond has 4 valence electrons, and these are ALL engaged in covalent bonding in a non-molecular, three dimensional array. They are no free electrons to carry a charge. On the other hand, in the graphite structure of its allotrope, graphite, electrons are delocalized across the structure, and these electrons CAN conduct an electric charge.

As regards the thermal conductivity of diamond, the material is an extremely efficient conductor of heat...and this can be attributed to the non-molecular structure of the material...which can effectively transmit heat by vibration along the lengths of the interconnected #C-C# bonds.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.