What term describes the flow of electrons from a location with an excess of electrons to a location with a deficiency of electrons?

The correct term for the flow of electrons from a location with an excess of electrons to a location with a deficiency of electrons is related to the concept of current. When there is an excess of electrons, it creates a negatively charged area, while a deficiency leads to a positively charged area. The movement of electrons will naturally occur from the negatively charged zone to the positively charged zone, thereby creating an electrical current.

In this context, "excess" accurately captures the condition of having more electrons than needed, which drives this movement. The other terms do not encapsulate the concept of electron flow in this manner. "Balance" refers to a state without any net flow, "deficiency" describes the lack of electrons, and "static" is related to the condition of stationary charges, none of which directly represent the flow of electrons between different concentrations.