Representations of Chemical Bonding Analysis of the Na2He Structure via the SSAdNDP Method (image) Utah State University Share Print E-Mail Caption Ball-and-stick representation, left, and polyhedral representation, right, of chemical bonding analysis of the Na2He structure, where half of the Na8 cubes are occupied by He atoms (shown as polyhedra) and half by two electrons (shown as red spheres.). Pink and gray atoms represent Na and He, respectively. Credit Ivan Popov/Utah State University Usage Restrictions Please credit Ivan Popov/Utah State University Share Print E-Mail 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.