"An image at left labeled aluminum atom has a mix of red and blue balls in its center and 3 concentric black rings around the center. The inner ring has 2 small green balls on it. The middle ring has 6 small green balls on it. The outer ring has 3 small green balls on it. A blue arrow leads to an image at right labeled aluminum ion with a mix of red and blue balls in its center. 2 concentric black rings around the center. The inner ring has 2 small green balls on it. The middle ring has 6 small green balls on it."/>