Write. Consult the periodic table of elements. Naming ionic compound with polyvalent ion. Some polyatomic anions contain oxygen. Naming ionic compound with polyvalent ion. Covalent or molecular compounds form when elements shareelectrons in a covalent bond to form molecules. Why? Common polyatomic ions. Polyatomic ions. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. maycilla_ Key Concepts: Terms in this set (20) Order the Events to describe ionic compound formation. This is the currently selected item. The Roman numerals in fact show the oxidation number, but in simple ionic compounds this will always be the same as the metal’s ionic charge. An ionic compound always has two parts. It is still common to see and use the older naming convention in which the prefix bi- is used to indicate the addition of a single hydrogen ion. CC BY-SA 3.0. http://en.wikipedia.org/wiki/Ionic_compound When an element forms two oxyanions, the one with less oxygen is given a name ending in -ite and the one with more oxygen are given a name that ends in -ate. 2) Write the anion and its charge second (on the right). For example, Sodium has a +1 charge and Chloride has a -1 charge, so the ionic compound would be named Sodium Chloride. Polyatomic anions sometimes gain one or more H+ ions to form anions of a lower charge. Learn. Boundless vets and curates high-quality, openly licensed content from around the Internet. Then, we name the anion, cutting off the last syllable and adding the suffix -ide . 6. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Match. Example: KNO2 is potassium nitrite, while KNO3 is potassium nitrate. When working in chemistry, it is often convenient to write a chemical in symbols. Salts are composed of two ions (binary means two): ⚛ a cation (positively charged ion) ⚛ an anion (negatively charged ion) Cations can be … Example: The classic example is the chemical name for water, H2O, which is dihydrogen monoxide or dihydrogen oxide. An ionic compound is named first by its cation and then by its anion. If a metallic element has cations of different charges, which cation is used has to be indicated by its suffix (an older method) or by Roman numerals in parentheses after its name in writing (the Stock system). The anion is named by taking the elemental name, removing the ending, and adding “ide.” For example, F-1 is called fluoride, for the elemental name, fluorine. Worked example: Finding the formula of an ionic compound. Suppose that you want to name the compound that results from the reaction of lithium and sulfur. This notation is usually seen with metals since they commonly display more than one oxidation state or valence. You can find metals on the left and central sections of the periodic table (e.g., Barium, Radium, and Lead), while you can find non-metals on the right side of the table. Usually, the positively charged portion consists of metal cations and the negatively charged portion is an anion or polyatomic ion. An anionis a negatively charged ion. Its systematic name is copper (II) chloride, where copper’s oxidation number is indicated in parentheses. Most cations and anions can combine to form solid compounds that are usually known as salts. For example we … Identify the compound as an ionic compound first [begins with a metal and ends with nonmetal(s)]. Since some metallic elements form cations that have different positive charges, the names of ionic compounds derived from these elements must contain some indication of the cation charge. Naming Ionic Compounds Using -ous and -ic, Naming Ionic Compounds Using -ite and -ate, Naming Ionic Compounds Using hypo- and per-, Ionic Compounds Containing bi- and di- Hydrogen, Why the Formation of Ionic Compounds Is Exothermic, Double Displacement Reaction Definition and Examples, The Difference Between a Cation and an Anion, Compounds With Both Ionic and Covalent Bonds, Oxidation Definition and Example in Chemistry, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College. Ionic compounds consist of cations (positive ions) and anions (negative ions). She has taught science courses at the high school, college, and graduate levels. Naming Ionic Compounds 1 Naming Ionic Compounds What are the structural units that make up ionic compounds and how are they named? They have more than one ions. They have more than one element. Example: The bleaching agent sodium hypochlorite is NaClO. The positively charged ion or cation comes before the negatively charged ion or anion. Salts are simple inorganic binary ionic compounds. Therefore, the number of cations and anions in an ionic compound must be balanced to make an electrically neutral molecule. Remember, they may be either ionic or covalent compounds, so make sure you use the right naming method! The cation has the same name as its element. Because no other simpler formula is possible, there is no need to name it “calcium dibromide.” CaBr2 can be named using either the Stock method or the older, classic way of naming. A cation, which is a positively charged ion, and an anion which is negatively charged. Transfer of Electrons from metal to nonmetal Formation of Ions Attraction of oppositely charged ions. Ionic compounds are formed of a metal (cation) and a non-metal (anion). Created by. With my strategy and step by step examples, you will be naming compounds like a pro in no time! 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