Ionic Nomenclature Lesson 14 October 22nd, 2010

Nomenclature - a branch of taxonomy concerned with the application of scientific names to taxa, based on a particular classification scheme and in accordance with agreed international rules and conventions

Ionic Compounds: IUPAC Naming Metal non-metal -ide Consists of two types of monoatomic ions (elements with only one possible ion charge) The metal ion is always written first and retains its whole name The non-metal is written second and has a slight change, the ending (suffix) is changed to –ide

Ionic Compounds: IUPAC Naming Do not write ones (Ex Na1Cl1) and if both elements have the same number reduce to lowest terms (Ca2O2­ = CaO)

Example: Na+ Cl- use the cross over method NaCl IUPAC name: sodium chloride The metal name is written in full and the non-metal has the –ide­ suffix added to it. Sodium chloride

Binary compounds can be made up of more than two ions, provided that there are only two types of elements. Example: Al2O3 STUDY TIP: All metals in group 1 and 2 follow periodic law. Check all the others metals when naming.

Example: MgS = Magnesium sulphide Magnesium Phosphide = Mg2+ P3- Mg3P2

Practice LiF = BeO = Sr3P2 = K2Se = AlN= GaBr3 = Magnesium sulfied = Radium astatide = Cesium carbide = Lithium chloride = Calcium iodide = Strontium selenide = Barium oxide = Sodium chloride =

Ionic Multivalent Binary Compounds A multivalent compound is one that may have varied numbers of electrons in its valence shell. This occurs with elements that fall outside of the representative elements. The transition metals are elements that commonly have multiple valence shell electrons. This means that they can form compounds in various proportions.

Example: Copper + Oxygen Copper and oxygen could have two different formulas with two completely different properties. CuO and Cu2O In order to differentiate the two compounds we must use a different method to name them to avoid confusion.

Ionic Multivalent Binary Compounds: IUPAC Naming Metal (charge) non-metal-ide Same as Ionic Binary but it indicates the metals charge List the metal name first After the metal name indicate the ion charge in brackets using roman numerals. The non-metal has -ide suffix added. Do not write 1’s and reduce when possible ONLY SHOW ROMAN NUMERALS FOR MULTIVALENT COMPOUNDS Not all transition metals are multivalent and thus do not have roman numerals

Example: SnO2  Sn4+O2-  tin (IV) oxide SnO  Sn2+O2-  tin (II) oxide

Practice MnO = MnO2 = FeN = Fe3N2 = Sc2S3 = Cr3N2 = Cr2O3 = CuO = HgF = NiF3 = CoI2 = Fr2O = BaO = CrSe = Mercury (II) iodide = Iron (II) oxide = Copper (I) oxide = Gold (III) nitride = Nickel (II) oxide = Mercury (I) bromide Silver sulphide = Tin (IV) oxide = Lead (II) fluoride = Bismuth (V) iodide = Tin (II) selenide = Yttrium nitride = Copper (II) sulfide = Platinum (IV) nitride = Niobium (III) chloride = Scandium fluoride =