Carbon is represented by Fire, for convenience of triplex bonding.

Also flavor-wise, fire→soot→carbon.



Also flavor-wise, fire→soot→carbon. Hydrogen is represented using Water, because water has the formula H2O,

and is the origin of the "hydro-" prefix [en.wiktionary.org] .



and is the origin of the "hydro-" prefix . The previous choice leaves Air available for representing Oxygen.



Earth can be used for heteroatoms such as Nitrogen, Sulphur, etc.



Salt can be used for halogens such as Chlorine ("halogen"="salt-producing")





Alternating single and double bonds in carbon rings are represented using partial triplex bonds.



Other bonds may vary from puzzle to puzzle.



Single bonds are usually represented by standard bonds, but may sometimes be depicted as a partial triplex bond



Double / triple bonds may be shown as triplex bonds, or they may be simplified into a standard bond. Even though it is possible to have triplex bonds between non-fire atoms, such a level of complexity/difficulty is not always desired in a puzzle.

Disclaimer:

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Benzene, polycyclic aromatic hydrocarbons, and other aromatic and organic compounds.The following convention is used:This should provide the maximum versatility, enabling the creation of a wide variety of puzzles based on actual molecules.Opus Magnum ischemistry, and although these puzzles are inspired by real life molecular structures, they are not guaranteed to be "realistic" representations of reagents, products, or reactions, nor is there a means of enforcing solutions that are consistent with real world chemical processes.