This is a calotte model of cyclohexane. Cyclohexane is a Cycloalkane with the Molecular formula C 6 H 12 The white spheres represent hydrogen atoms, which surround a ring of carbon atoms (in grey). Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6

Space-filling models (also known as calotte models or CPK models^[1] by Corey, Pauling and Koltun), like ball-and-stick models, belong to the 3D or spatial molecular models, which serve to display the structure of chemical products and substances or biomolecules. Robert Brainard Corey (August 19 1897 – April 23 1971 was an American biochemist mostly known for his role in discovery of the α-helix and the β-sheet Linus Carl Pauling (February 28 1901 – August 19 1994 was an American Scientist, Peace activist, Author and educator. Ball-and-stick models and Space-filling models (also known as Calotte models) are 3D or spatial Molecular models which serve to display the structure Three-dimensional space is a geometric model of the physical Universe in which we live A molecular model, in this article is a physical model that represents Molecules and their processes A chemical substance is a Material with a definite chemical composition. A biomolecule is any organic Molecule that is produced by living Organisms including large Polymeric molecules such as Proteins

This calotte model of one of the many isomers of octane illustrates how the 18 hydrogen atoms (white) line the backbone of 8 carbon atoms (grey)

The calotte model is a further development of the ball-and-stick model, with which the configuration of molecules can be vividly presented. This article is about the chemical concept For "isomerism" of atomic nuclei see Nuclear isomer. Octane is a straight-chain Alkane with the Chemical formula CH3(CH26CH3 Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6 In Chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two Atoms in a definite arrangement held together by With it, the atoms of individual elements are represented by multicolored spherical sections. History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny A chemical element is a type of Atom that is distinguished by its Atomic number; that is by the number of Protons in its nucleus. Atom size, bond angle and bond length correspond to the actual relationships. Molecular geometry or molecular structure is the three- Dimensional arrangement of the Atoms that constitute a Molecule. In Molecular geometry, bond length or bond distance is the average distance between nuclei of two bonded Atoms in a Molecule. The result is a clear and (depending on construction materials and execution) flexible model of the molecule. Presentation is also possible using software.

References

1. ^ Robert B. Corey and Linus Pauling (1953): Molecular Models of Amino Acids, Peptides, and Proteins. Review of Scientific Instruments, Volume 24, Issue 8, pp. 621-627. doi:10.1063/1.1770803

See also

• Van der Waals surface
• CPK coloring
• Molecular graphics
• Software for molecular modeling

External links

• More on molecular models and a couple of examples from chemistry and biology (article is in German)