The is the difference in charge between the intracellular and extracellular space of a neuron.

The answer to this question would be: membrane potential

Membrane potential of a cell is determined by the difference in the concentration of their ion. The resting potential of the membrane should be around -70mVNatrium/sodium and chlor will be much more outside cells than inside cells, but kalium/potassium will be much higher inside the cells. 

The answer should be geothermal i hope i’m right message me if i’m wrong and i’ll change my answer and fix it for you