1. Naming Ionic Compounds and Writing Formulas

2. Simple Ionic Naming First element Second element
a metal that is in group 1A, 2A or aluminum in group 3A
Second element
a nonmetal
The metal keeps its name and the nonmetal changes it’s ending to –ide.
Ex) MgBr2 

3. Transition Metals Look at first element
it has a metal that is in the
transition or other metal section
Use a roman numerals to indicate
the elements charge
Name the second element changing the ending to –ide
Ex) FeCl3 
To figure out the charge use this formula
Subscript(charge of cation) + subscript (charge of anion)= 0

4. Polyatomic Ions More than 2 elements in the compound.
Identify where the 2 halves of the compound are. Name each half
First half can have a metal, a transition metal or a polyatomic ion (ammonium NH4)
Second half is a nonmetal or polyatomic ion.
All polyatomic ions have their own names and can be reference on the back of your periodic table.
Ex) NH4Cl  ammonium chloride
Ex) Mg3(PO4)2 

5. Try these
Ba3(PO4)2
CuNO3
NH4OH

6. Writing Formulas Chemical formula from its name:
Write the symbol and charge for each ion
Crisscross the charges so they become the subscripts on the other ion
Add any parentheses if needed

7. Try these
copper(II) chloride
lithium phosphate
iron (III) hydroxide