Any time you know the "ate" ending is used on the polyatomic, you use "ic" when its an acid. Polyatomic ions. For ions in group VA, VI, and VIIA, the magnitude of charge is calculated by subtract-ing the group number from 8. 3) HClO 3 has the ClO 3 ¯ polyatomic ion and its name is chlorate. Monatomic Cations (multiple oxidation state) Name (Roman numeral gives the positive charge!) . Other oxidation states are commonly encountered for metals in polyatomic ions, where the metal is not the cation of a compound. Common polyatomic ions. If you're seeing this message, it means we're having trouble loading external resources on our website. The name of HClO 3 is chloric acid. Polyatomic Ions and Their Charges (it takes up two pages…just warning) +1 Charge *Ammonium NH4 +1 Hydronium H3O+1 Mercury (I) Hg2 +2-1 Charge *Acetate C2H3O2-1? A molecular ion is a covalently bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero. (The prefix poly-carries the meaning "many" in Greek, but even ions of two atoms are commonly described as polyatomic.) Non-metal elements have a common or fixed charge/ oxidation when compounded with metals. Polyatomic ions with a positive 1 charge do occur, but the main one you'll encounter and need to know is the ammonium ion. This is the currently selected item. Therefore: Per manganate MnO 4 1- ** Group IVA oxyanions have 2-charges instead of the expected 4-! Remember, because it is a cation, when it reacts and forms a compound, it is cited first in the chemical formula. Note: this list contains commonly-found oxidation states. The name of HClO 2 is chlorous acid. Yet oxidation values can vary depending on which non-metal elements they are combined with, as in polyatomic ions and molecu-lar compounds. Since the "ite" suffix is used, it gets changed to "ous." Oxidation states not shown exist, but they are less-frequently encountered and therefore not "common." When an ion has a pair of atoms, it is known as a polyatomic ion. List of Common Ions Polyatomic Cations NH4 + ammonium H3O + hydronium Polyatomic Anions OH-hydroxide CN-cyanide O2 2-peroxide CO3 2-carbonate C2O4 2-oxalate NO2-nitrite NO3-nitrate PO3 3-phosphite PO4 3-phosphate SO3 2-sulfite SO4 2-sulfate S2O3 2-thiosulfate ClO-hypochlorite ClO2-chlorite ClO3-chlorate ClO4-perchlorate CH3COO or C2H3O2-acetate AsO4 3-arsenate Why? Link to Interactive Transitional Metal Polyatomic Ions * In Per manganate the Per means more charge (add +1 to manganate’s charge), not more oxygen as in perchlorate. ... Naming monatomic ions and ionic compounds. Well-known examples are sodium hydroxide (NaOH) with OH-as the polyatomic anion, calcium carbonate (CaCO 3), and ammonium nitrate (NH 4 NO 3), which contains two polyatomic ions: NH + and NO 3-. ammonium - NH 4 + Polyatomic Ion Charge = -1 . Unlike a molecule, which has a net charge of zero, this chemical species is an ion. It is an ion where oxygen and hydrogen atoms are linked and work together to help each other form more complicated bonds with different atoms. learn about monoatomic and polyatomic ions and how they are located and named. The name of this ion is chlorite. Polyatomic ions are treated exactly like monatomic ions. How to name ionic compounds containing common polyatomic ions.