What is the only non metallic element that conducts electricity ?
The answer you are looking for is probably Carbon, and to be more specific, graphite (an allotrope of Carbon). However, your question makes the false assumption that there is only “one non metallic” element which will conduct electricity. Noble gasses will conduct electricity when a high enough voltage is applied to them…this is commonly seen in “Neon” lights (Neon being a Noble gas, but other gasses can be used as well, such as Argon or Krypton). There are also things known as semi-conductors…non-metallic elements which will conduct electricity under certain conditions (for example, if you mix [‘dope’] it with something else)…Silicon being a very well known semi-conductor. As a matter of fact, if you apply a high enough voltage to just about anything, be it a metal or a conductor, it can conduct an electric current…nothing is a ‘perfect’ insulator.
