What materials would not conduct electricity?
insulators semi-conductors and conductors are classified by their valence band gap
For a material to conduct electricity , it has to be impure , so for example pure silicon cannot conduct electricity but Silicon chips in computers that are mixed with other things can. So the materials that conduct are charged with little particles that allow the flow of electricity Because of electrolytes. Or because of the metal something is made of.
Materials that conduct allow electricity to pass through them (most metals) and things that don't conduct are the opposite. (e.g cotton) The most simple way is to identify if it is conductor is that most metals can normally conduct, and some obvious things like plastic, and cotton, can not. Basically explained.
Ammonia is a gas. Gases do conduct electricity, as all materials do. However, they conduct electricity so poorly that we consider them insulators. "Electricity" requires the movement of electrons. In a gas, these electrons are too dispersed to provided any measurable current. So it does conduct electricity and heat, however conducts them both very poorly ;')
Planets themselves probably do not conduct electricity, although it is likely that most planets do contain some conductive materials. The vast majority of the matter on the Earth does not conduct electricity very well, although large deposits of iron, silver, gold and copper all _DO_ conduct electricity.
Materials with ionic bonds normally conduct electricity only in a liquid state. However metals, which have what are sometimes called "delocalized" ionic bonds, also conduct electricity in the solid state. It is now customary to consider metallic bonds a separate class from both ionic and covalent bonds.