Name a non metal which is …

Graphite

1) Graphite is soft and slippery because there are only weak intermolecular forces between its layers. Graphite is a good conductor of heat and electricity.

2) Graphite can conduct electricity because of the delocalised (free) electrons in its structure.

3) These arise because each carbon atom is only bonded to 3 other carbon atomsHowever, in diamond, all 4 outer electrons on each carbon atom are used in covalent bonding, so there are no delocalised electrons.

4) These electrons in graphite are free to move through the structure.

Non-metals are elements that generally cannot conduct electricity. They are the second-largest class of elements after metals. Carbon is the only non-metal which conducts electricity. It is classified as a semi-metal when it is in the form of graphite. In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence, there won’t be a flow of electrons That is the reason behind the diamond is bad conductor electricity.