Start studying Naming Ionic Compounds. Nomenclature for Covalent or Molecular Compounds. CC BY-SA 3.0. 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. Predicting Formulas of Ionic Compounds. The polyatomic ion name stays the same. CC BY-SA 3.0.,,,,, Convert between the chemical formula of an ionic compound and its name. One example is the ammonium Sulfate compound in Figure 4.6. Example: The bleaching agent sodium hypochlorite is NaClO. For example, Cu(NO3)2 is copper (II) nitrate, because the charge of two nitrate ions (NO3−1) is 2\cdot(-1) = -2. These endings are added to the Latin name of the element (e.g., stannous/stannic for tin) to represent the ions with lesser or greater charge, respectively. Naming Ionic Compounds . Ionic compounds have high melting and boiling points, and they tend to be hard and brittle. Naming Ionic Compounds Using -ide H - Hydride F - Fluoride O 2- Oxide S 2- Sulfide N 3- Nitride P 3- Phosphide Example: FeCl3 is ferric chloride or iron(III) chloride. Thus, in an ionic bond, one ‘bonder’ must have a positive charge and the other a negative one. IUPAC Naming of Salts (Binary Inorganic Ionic Compounds) Introductory Chemistry Tutorial Key Concepts. Ionic compounds contain a metal and a nonmetal. Wikipedia Refer to the periodic table of elements to see what categories the elements in the compound belong to. Salts are simple inorganic binary ionic compounds. Naming polyatomic ionic compounds is the tricky one, and there are several rules depending on the different ions involved. Example: The classic example is the chemical name for water, H2O, which is dihydrogen monoxide or dihydrogen oxide. CC BY-SA 3.0. How Ionic Compounds Are Named. Ionic compounds are formed of a metal (cation) and a non-metal (anion). Figure \(\PageIndex{2}\): Naming Ionic Compounds with Polyatomic Ions For example, NaF is also known as sodium fluoride. 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. What Are the Rules for Assigning Oxidation Numbers? Wikipedia This is the currently selected item. Chemical Nomenclature is the systematic naming of chemical compounds. Compounds With Both Ionic and Covalent Bonds. Ions can be single atoms, as the sodium and chlorine in common table salt (sodium chloride), or more complex groups such as the carbonate in calcium carbonate. When naming ionic compounds, the cation retains the same name as the element. Example: KNO2 is potassium nitrite, while KNO3 is potassium nitrate. Therefore, the number of cations and anions in an ionic compound must be balanced to make an electrically neutral molecule. Consult the periodic table of elements. CC BY-SA. For example, Sodium has a +1 charge and Chloride has a -1 charge, so the ionic compound would be named Sodium Chloride. 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. The older method uses the suffixes -ous and -ic to denote the lower and higher charges, respectively. Naming Ionic Compounds 1. They have a giant lattice structure with strong ionic bonds. Worked example: Finding the formula of an ionic compound. The first part of the name is the name of the metal element. In the case where there is a series of four oxyanions, the hypo- and per- prefixes are used in conjunction with the -ite and -ate suffixes. If either the cation or the anion was a polyatomic ion, the polyatomic ion name is used in the name of the overall compound. The anion’s name is similar to the elemental name, but the ending of the name has been removed and replaced with “ide.”. Naming ionic compounds with -ide and -ate The name of an ionic compound ends in: -ide if it contains just two elements -ate if it contains three or more elements, one of which is oxygen The -ide ending is added to the name of a monoatomic ion of an element. In all cases, ionic compound naming gives the positively charged cation first, followed by the negatively charged anion. 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. One example is the ammonium Sulfate compound in Figure \(\PageIndex{6}\). For example, CuCl2 indicates a molecule where one Cu2+ cation associates with two Cl– anions to form a neutral compound. Salts are composed of two ions (binary means two): ⚛ a cation (positively charged ion) ⚛ an anion (negatively charged ion) Cations can be … By sticking to each other, they resolve, or partially resolve, their separate charge imbalances. Stock systemA system of naming that includes using Roman numerals to indicate the charge on transition metals. Usually, the positively charged portion consists of metal cations and the negatively charged portion is an anion or polyatomic ion. This compound is therefore, copper (II) nitrate. This system is still used, although it has been officially supplanted by the more precise, if slightly cumbersome, Stock system. Anion Definition and Examples. Boundless Learning Ionic compound nomenclature or naming is based on the names of the component ions. Naming Compounds – Part 1 – YouTube: This video explains how to name covalent and ionic compounds. Practice: Find the formula for ionic compounds. The process of naming ionic compounds with polyatomic ions is the same as naming binary ionic compounds. Ionic compounds. 6. There is no space between the element name and the parenthesis. Know what makes a compound ionic. Most cations and anions can combine to form neutral, solid compounds that are usually known as salts. Name the cation (the more electropositive one) first and the anion (the more electronegative one) second. Most cations and anions can combine to form neutral, solid compounds that are usually known as salts. When a metal element reacts with a non-metal element an ionic compound is formed. The one overriding requirement is that the resulting compound must be electrically neutral: therefore the ions Ca2+ and Br– combine only in a 1:2 ratio to form calcium bromide, CaBr2. When naming ionic compounds, all of the information you’ll need is on the periodic table. Wikipedia The net charge of an ionic compound must be zero. She has taught science courses at the high school, college, and graduate levels. Suppose that you want to name the compound that results from the reaction of lithium and sulfur. 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). For example, K+1 is called  the potassium ion, just as K is called the potassium atom. But to be considered an ion, they must carry a positive or negative charge. Naming Ionic Compounds with Polyatomic Ions. Ionic Compound Naming and Formula Writing List 1. The cation is named first, followed by the anion. Positive to positive and negative to negative ionic bonds do not occur. Polyatomic anions sometimes gain one or more H+ ions to form anions of a lower charge. Here are the principal naming conventions for ionic compounds, along with examples to show how they are used: A Roman numeral in parentheses, followed by the name of the element, is used for elements that can form more than one positive ion. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. Since the net charge of the ionic compound must be zero, the Cu ion has a 2+ charge. The name of an ionic compound. 2. Ionic compounds consist of cations (positive ions) and anions (negative ions). When you name ionic compounds, you write the name of the metal first and then the nonmetal. In the cases of iron and copper, the Latin names of the elements are used (ferrous/ferric, cuprous/cupric). 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. The positively charged ion or cation comes before the negatively charged ion or anion. The Roman numeral naming convention has wider appeal because many ions have more than two valences. The cation has the same name as its element. The hypo- and per- prefixes indicate less oxygen and more oxygen, respectively. Build the name. An ionic compound is named first by its cation and then by its anion. Practice: Naming ionic compounds. Although Roman numerals are used to denote the ionic charge of cations, it is still common to see and use the endings -ous or -ic. The net charge of an ionic compound must be zero. This notation is usually seen with metals since they commonly display more than one oxidation state or valence.

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