Illustrated Glossary of Organic Chemistry

Space-filling model (CPK model, calotte model): A representation of molecular structure in which atoms are shown as spheres whose diameters are proportional to their atomic radii. The center-to-center distance between the spheres is proportional to the corresponding bond lengths.

Methane

Lewis structure		Space-filling model

α-D-Glucopyranose

Molecular model kit		Space-filling model