The best conductor of electricity among metals can be identified by looking at its electrical conductivity. Electrical conductivity is a measure of how easily a material can conduct an electric current. Metals with high electrical conductivity allow electric currents to flow through them with minimal resistance.

One way to determine which metal is the best conductor is to compare their electrical conductivity values. For example, silver has the highest electrical conductivity of all metals, followed by copper, gold, aluminum, and so on. Therefore, silver is considered the best conductor among metals.

On the other hand, the worst conductor of electricity among metals can be identified by looking at materials with low electrical conductivity. Materials with low electrical conductivity impede the flow of electric current, resulting in greater resistance.

One way to determine which metal is the worst conductor is to compare their electrical conductivity values as well. For example, materials like manganese, iron, and steel have lower electrical conductivity compared to metals like silver and copper. Therefore, manganese, iron, and steel are considered poor conductors compared to other metals.