Dipole Moment of a Layer (IMAGE) Moscow Institute of Physics and Technology Caption Positive sodium ions Na? are shown in red, negative chloride ions Cl? are shown in blue. Credit Source: https://en.wikipedia.org/wiki/Electric_dipole_moment. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.