RelativeResourceManager(3) - When two or more elements...

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3 of 17 When two or more elements combine to form an ion, they are called polyatomic ions. Some polyatomic ions commonly encountered in soil reactions are listed in the following table. Name Symbol Valence Molecular Wt. (g/mole) Ammonium NH 4 + +1 18.0 Hydroxide OH - -1 17.0 Acetate CH 3 OOO - (Oac - ) -1 59.0 Nitrate NO 3 - -1 62.0 Phosphate PO 4 3- -3 95.0 Carbonate CO 3 2- -2 60.0 Sulfate SO 4 2- -2 96.1 Borate BO 3 3- -3 58.8 Molybdate MoO 4 2- -2 159.9 B. Nomenclature of Chemical Compounds Certain common names like water and ammonia are still widely used. However, common names are often not suitable for describing compounds in chemistry. A systematic naming system was developed to relate a compound's name to its composition, and in some cases, its structure. Following is a brief discussion of some of the rules of chemical nomenclature that will be used throughout this course. 1. Cations "ic" and "ous" For cations having two valence states, the higher valence is ic and lower valence is ous . Examples:
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