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Wood is a thermal insulator. It is a poor conductor of heat.
Aluminum is a conductor of thermal energy and electrical energy.
Yes, that is what "good thermal conductor" means.
No
No, krypton is not a good thermal conductor. It is a noble gas and has very low thermal conductivity compared to other materials.
Something that conducts thermal energy well is a thermal...conductor. If it does not conduct well it is called an insulator.
Astatine is not a good thermal conductor. It is a poor conductor of heat due to its low thermal conductivity, similar to other halogens. This makes astatine a relatively inefficient material for transferring heat.
No, potassium is not a good thermal conductor compared to other materials. It has a relatively low thermal conductivity, meaning it is not efficient at transferring heat.
steel
No, paper is not a good thermal conductor. It is a poor conductor of heat, which is why it is commonly used as insulation to keep things warm, like wrapping food or drinks.
Plastic is an electrical and thermal insulator.