Ionic Nomenclature

Lesson 14 October 22 nd , 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) 1.

2.

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 Na 1 Cl 1 ) and if both elements have the same number reduce to lowest terms (Ca 2 O 2 = 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: Al 2 O 3  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 =

Mg 2+ P 3 Mg 3 P 2

Practice

LiF = Sr 3 P 2 = AlN= Magnesium sulfied = Cesium carbide = Calcium iodide = Barium oxide = BeO = K 2 Se = GaBr 3 = Radium astatide = Lithium chloride = Strontium selenide = 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 Cu 2 O  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:

  SnO 2  Sn SnO  4+ Sn O 2+ 2 O 2  tin (IV) oxide  tin (II) oxide

Practice

MnO = FeN = Sc 2 S 3 = Cr 2 O 3 = HgF = CoI 2 = BaO = Mercury (II) iodide = Copper (I) oxide = Nickel (II) oxide = Silver sulphide = Lead (II) fluoride = Tin (II) selenide = Copper (II) sulfide = Niobium (III) chloride = MnO 2 = Fe 3 N 2 = Cr 3 N 2 = CuO = NiF 3 = Fr 2 O = CrSe = Iron (II) oxide = Gold (III) nitride = Mercury (I) bromide Tin (IV) oxide = Bismuth (V) iodide = Yttrium nitride = Platinum (IV) nitride = Scandium fluoride =