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Several of the CPK colors refer mnemonically to colors of the pure elements or notable compound. For example, hydrogen is a colorless gas, carbon as charcoal, graphite or coke is black, sulfur powder is yellow, chlorine is a greenish gas, bromine is a dark red liquid, iodine in ether is violet, amorphous phosphorus is red, rust is dark orange-red, etc.
These early models also established the CPK coloring scheme that is still used today to differentiate the different types of atoms in molecular models (e.g. carbon = black, oxygen = red, nitrogen = blue, etc). This early model was improved upon in 1966 by W.L. Koltun and are now known as Corey-Pauling-Koltun (CPK) models. [5]
The article currently fails to explain that "CPK colors" is a very loose term that is used by different softwares and kit makers to label very different color schemes. The Jmol webpage has a table showing the hex color values and the difference between its coloring and that of Rasmol (which itself has two versions).
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 aspects of models Francis Crick and James D. Watson: 1953 spikes, flat templates and connectors with screws model of DNA Molecular graphics
CPK coloring, a way to color atoms when visualizing molecular models; Creatine phosphokinase, an enzyme found in humans, or alternatively a blood test for it;
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Nutrition (per order): 170 calories, 0 g fat (0 g saturated fat), 0 mg sodium, 33 g carbs (2 g fiber, 3 g sugar), 11 g protein CPK's Dakota Smashed Pea and Barley Soup is a protein-packed, no-fat ...
Gaseous elements present a particular challenge to the question, which the current curators of this template seem to have decided on the basis of image prettiness. (Recall earlier, their objection at Oxygen, that a space-filling representation of dioxygen met with disapproval, where it was asked, "why… bulbous" and "red", i.e., the CPK color ...