Which would you predict would be the heaviest and the lightest materials that would be good conductors of electricity?

Graphene, and Silver

Explanation:

A conductor can be defined as the object or material that allows the flow of electrical current in it.

Graphene is a lightest material and it acts as a good conductor of electricity.   The graphene electrons move faster as compared to any other material at room temperature. It allows it to conduct electricity.

Silver is a heaviest material and also exhibit highest electrical conductivity among other metals.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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a plasma is a warm ionized gasoline consisting of approximately equal numbers of definitely charged ions and negatively charged electrons. the characteristics of plasmas are notably unique from the ones of ordinary neutral gases in order that plasmas are considered a awesome "fourth kingdom of remember."