← Atkins/Jones - 00.00 Fundamentals D, The Nomenclature of Compounds Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Common Name Systematic Name Chemical Nomenclature An informal, everyday name. A name that reveals the elements present and in some cases the arrangement of the atoms. The systematic naming of compounds according to set rules. Oxidation Number The charge of a cation. Iron iron(II) ions = ferrous ions iron(III) ions = ferric ions D.1 Names of Cations Summary The name of a monatomic cation is the name of the element plus the word ion; for elements that can form more than one type of cation, the oxidation number, a Roman numeral including the charge, is included. D.2 Names of Anions Summary Names of monatomic anions end in -ide. Oxoanions are anions that contain oxygen.The suffix -ate indicates a greater number of oxygen atoms than the suffix -ite within the same series of oxoanions. In a series of three or more related oxoanions the prefix per- indicates the maximum number of oxygen atoms; the prefix hypo- indicates the least number of hydrogen atoms. Hydrates Ionic compounds with crystals that incorperate a definite proportion of molecules of water. D.3 Names of Ionic Compounds Summary Ionic Compounds are named by starting with the name of the cation (with its oxidation number if more than one charge is possible), followed by the name of the anion; hydrates are named by adding the word hydrate, preceded by a Greek prefix indicating the number of water molecules in the formula unit. D.4 Names of Inorganic Molecular Compounds Summary Binary molecular compounds are named by using Greek prefixes to indicate the number of atoms of each element present; the element named second has its ending changed to -ide. D.5 Names of Organic Compounds Summary The names of organic compounds are based on the names of the parent hydrocarbons; alcohols contain -OH groups, carboxylic acids contain -COOH groups, and haloalkanes contain halogen atoms.