Molecular model
Videos
A molecular model is a physical model of an atomistic system that represents molecules and their processes. They play an important role in understanding chemistry and generating and testing hypotheses
Hofmann's croquet set illustrating how molecules are constructed
Hofmann's model for methane, now known to depict an incorrect geometry
Sodium chloride (NaCl) lattice, showing close-packed spheres representing a face-centered cubic AB lattice similar to that of NaCl and most other alkali halides. In this model the spheres are equal sizes whereas more "realistic" models would have different radii for cations and anions.
A modern plastic ball and stick model. The molecule shown is proline
CPK coloring
Videos
In chemistry, the CPK coloring is a popular color convention for distinguishing atoms of different chemical elements in molecular models.
Molecular model
…the development of stereochemistry John Desmond Bernal c. 1930 Plasticine and spokes model of liquid water Robert Corey, Linus Pauling, Walter Koltun (CPK coloring) 1951 Space-filling models of alpha-helix, etc. Pauling's "Nature of the Chemical Bond" covered all aspects of molecular structure and influenced many…
A box of ball-and-stick model pieces colored to represent several of the common elements.