Ionic Compounds

Ionic Compounds naming, formula writing, examples, and properties

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Rules for Writing Formulas for Ionic Compounds

Posted by Owell on July 28, 2011 at 10:24 PM
Rules for Writing Formulas for Ionic Compounds
1.     Write the metal symbol first and then the non metal symbol second.
Ca                           I
2.     Write the cation charge above the metal and the anion charge above the non metal
2+                         1-
       Ca                     I
3.     Do the crossover rule and write the charge for the cation as a subscript for the non metal symbol and the charge for the anion as a subscript for the metal.
2+                         1-
                       Ca                    I     à CaI2     ß subscript goes at the                                                                                                                         bottom of the symbol
                                                                        and is smaller.
Rules for Naming Ionic Compounds
First Word – Name of the metal
Second Word – Name of the non-metal end in “ide”
Ex: Calcium Iodide
Rules for Naming Ionic Compounds with Transition Metals
The stock naming system uses roman numerals to indicate the charge of the cation because they can have more than one charge.
First Word – Name of the metal
Roman numeral in brackets to indicate the charge
Second Word – Name of the non-metal end in “ide”
Ex:              FeCl3 is Iron (III) chloride
                   FeO is Iron (II) oxide
                   Cu2S is coper (I) Sulfide
                   PbO2 is lead (IV) oxide
How do I know the charge for iron is 3? I use the reverse crossover rule
                                                3+               1-
Ex:              FeCl3 à                   Fe               Cl à   Iron (III)Cloride
Rules for Naming Ionic Compounds with Transition Metals
The stock naming system uses roman numerals to indicate the charge of the cation because they can have more than one charge.
First Word – Name of the metal
Roman numeral in brackets to indicate the charge
Second Word – Name of the non-metal end in “ide”
Ex:              FeCl3 is Iron (III) chloride
Rules for Naming Ionic Compounds with Transition Metals
The classic naming system uses the latin word with the ending “ous” to indicate the transition metal’s with the lower ion charge and the ending “ic” to indicate the greater ion charge of the transition metal.
For example: Fe is Ferrum and can have a charge of +2 ferrous or +3 ferric.
Element
Latin Name
Ion with lower charge
Ion with Higher Charge
Iron
                                    
Fe2+
Fe3+
Copper
Cuprum 
Cu+
Cu2+
Lead
Plumbum
Pb2+
Pb4+
Formula
Classical System
Stock System
FeCl3
Ferric Chloride
FeO
Ferrous Oxide
Cu2S
Coprous Sulfide
PbO2
Plumbic Oxide
Write the chemical formula for each
a) Copper (I) Oxide
b) Lead (IV) Bromide
c) Iron (III) Sulfide
d) Nickel (III) Flouride
e) Manganese IV) Fluoride

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