chemical classification
list of chemical classification and labeling systems
periodic table
table systematically placing elements based on atomic number and recurrent properties
Enzyme Commission number
hierarchical classification ID given to enzymes, identifying their membership in families
genetic series
series of chemical compounds that differ by a functional group in such a way that each subsequent compound is a derivative of the preceding compound, and each change of the functional group results from a specific chemical reaction
Hofmeister series
classification of ions in order of their ability to salt out or salt in proteins