The total charge for … The name of a binary compound containing monatomic ions consists of the name of the cation (the name of the metal) followed by the name of the anion (the name of the nonmetallic element with its ending replaced by the suffix –ide). That is, which one in the list is a molecular compound? It is the most electronegative ion. Download for free at http://cnx.org/contents/[email protected]). Chemists use nomenclature rules to clearly name compounds. Ti 33 N = TiN Ex. The charge of the metal ion is determined from the formula of the compound and the charge of the anion. The other fluoride of tin is SnF4, which was previously called stannic fluoride but is now named tin(IV) fluoride. Second, charges are not written in a formula. From the answers we derive, we place the compound in an appropriate category and then name it accordingly. 6.9: Binary Ionic Compounds and Their Properties, 6.18: Ionic Compounds Containing Polyatomic Ions. This module describes an approach that is used to name simple ionic and molecular compounds, such as NaCl, CaCO3, and N2O4. Have questions or comments? A balanced formula has a neutral electrical charge or net charge of zero. Write the formulas of the following ionic compounds: (a) chromium (III) phosphide (b) mercury (II) sulfide (c) manganese (II) phosphate (d) copper (I) oxide (e) chromium (VI) fluoride If the compound is molecular, does it contain hydrogen? NiO, nickel(III) oxide 5. ThoughtCo uses cookies to provide you with a great user experience. Here are the steps for writing and balancing the formula: Many familiar chemicals are ionic compounds. Can you write formulas for binary ionic compounds? Molecular compounds can form compounds with different ratios of their elements, so prefixes are used to specify the numbers of atoms of each element in a molecule of the compound. For example, you may see the words stannous fluoride on a tube of toothpaste. Write the name of the anion (- nonmetal) last. Out-of-date nomenclature used the suffixes –ic and –ous to designate metals with higher and lower charges, respectively: Iron(III) chloride, FeCl3, was previously called ferric chloride, and iron(II) chloride, FeCl2, was known as ferrous chloride. Name the following ionic compounds, which contain a metal that can have more than one ionic charge: The anions in these compounds have a fixed negative charge (S2−, Se2− , N3−, Cl−, and \(\ce{SO4^2-}\)), and the compounds must be neutral. Cations include metals and they are often located on the left-hand side of the periodic table. This leads to a formula of NaCl . Write the cation first, followed by the anion. If so, does it also contain oxygen? If the metal can form ions with different charges, a Roman numeral in parentheses follows the name of the metal to specify its charge. 8. An example is potassium chloride, KCl. Thus, FeCl2 is iron(II) chloride and FeCl3 is iron(III) chloride. Legal. Potassium (K +) has a 1- charge, while chlorine (Cl -) has a 1- charge. Mn 24 S = MnS 2 Naming Binary Ionic Compounds To write the name: 1. This represents the formula SnF2, which is more properly named tin(II) fluoride. Examples are shown in Table \(\PageIndex{2}\). Though this naming convention has been largely abandoned by the scientific community, it remains in use by some segments of industry. The formula is always written in the lowest ratio. OXYGEN ATOM. Sometimes an ionic formula contains compound ions – a group of atoms bonded together with an overall charge. The formula for ionic compounds are called empirical formulas. Ionic and molecular compounds are named using somewhat-different methods. 2.6. SO2, sulfur dioxide 3. Because most metals form cations and most nonmetals form anions, formulas typically list the metal first and then the nonmetal. Other examples are provided in Table \(\PageIndex{3}\). To name an inorganic compound, we need to consider the answers to several questions. Some examples are given in Table \(\PageIndex{2}\). Write the name of the cation ( + metal) first 2. The formula of an ionic compound can be deduced from the formulae of its ions.