Introduction to Free Electron Density
Free electron density refers to the number of free electrons in a unit volume conductor. The free electron density of copper is. The free electron density of various metals is of the same order of magnitude. Aluminum has a higher free electron density than copper, aluminum has three free electrons, copper has two free electrons, and the electron cloud radius of aluminum is smaller than that of copper, so aluminum has a higher free electron density than copper. But because aluminum is more attractive to copper than copper, copper is more conductive when it is energized.