CPK coloring
Videos
In chemistry, the CPK coloring is a popular color convention for distinguishing atoms of different chemical elements in molecular models.
A plastic ball-and-stick model of proline. These models usually comply with CPK coloring.
Hofmann's methane model
A box of ball-and-stick model pieces colored to represent several of the common elements.
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
CPK coloring
…In chemistry, the CPK coloring (for Corey–Pauling–Koltun) is a popular color convention for distinguishing atoms of different chemical elements in molecular models. August Wilhelm von Hofmann was apparently the first to introduce molecular models into organic chemistry, following August Kekule's introduction of…
Hofmann's croquet set illustrating how molecules are constructed
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.