If P(x,y,z) dx dy dz is the probability of finding an electron in the volumeelement dx dy dz at the point of a molecular entity with coordinates x,y,z, then P(x,y,z) is the electrondensity at this point. For many purposes (e.g., X-ray scattering, forces on atoms) the system behaves exactly as if the electrons were spread out into a continuously distributed charge. The term has frequently been wrongly applied to negative charge population. See also chargedensity.
