bakelite
No! Its an excellent conductor.
Electrical or thermal? Either way, it's an insulator.
Copper is a good electrical and thermal conductor.
Oxygen. Carbon as diamond is a good electrical insulator, (graphite is an electrical conductor), silicon is a semiconductor so has limited electrical conductivity and aluminium is a metal and a good electrical conductor.
Magnesium oxide is an electrical insulator.
insulator
It really depends what material it is made of, but clothing is usually a fairly good insulator, unless it gets wet.
Helium as a gas is an electrical insulator.
babies, rocks, cabbage, and habberdasheries are neither good electrical conductors, nor insulators.
If it is made of metal, it is a conductor. If it is wooden, it is an insulator.
If we speak in terms of electrical conductivity, some good insulators are ceramics, plastics, rubber and glass. Conductors are, on the other hand, metals in general: copper, silver, gold, but there are some good conductors that are not metals, like graphite and some salt solutions.
Coins are made of metal and therefore they are good electrical conductors.