![]() ![]() The chemical element of each atom is often indicated by the sphere's color. In a good model, the angles between the rods should be the same as the angles between the bonds, and the distances between the centers of the spheres should be proportional to the distances between the corresponding atomic nuclei. ![]() Double and triple bonds are usually represented by two or three curved rods, respectively, or alternately by correctly positioned sticks for the sigma and pi bonds. ![]() The atoms are typically represented by spheres, connected by rods which represent the bonds. In chemistry, the ball-and-stick model is a molecular model of a chemical substance which is to display both the three-dimensional position of the atoms and the bonds between them. A plastic ball-and-stick model of proline
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