Warm Up Naming Ions:
CrO42-
Aluminum Ion
Ammonium ion
Ba+2
Cr+2
Chromium (III) ion
Cobalt (II) ion
Bromide ion
Carbonate ion
ClOxide ion
N3Cu+
Lithium ion
Hydrogen ion
PO43Fe+3
Fluoride ion
Iodide ion
Nitrate ion
OHISe2-
Warm Up Naming Ions:
Aluminum Ion
Ammonium ion
Barium ion
Chromium (II) ion
Chromium (III) ion
Cobalt (II) ion
Copper (I) ion
Lithium ion
Hydrogen ion
Phosphate ion
Iron (III) ion
Al+3
NH4+
Ba+2
Cr+2
Cr+3
Co+2
Cu+
Li+
H+
PO43Fe+3
Chromate ion
Bromide ion
Carbonate ion
Chloride ion
Oxide ion
Nitride ion
Fluoride ion
Hydroxide ion
Iodide ion
Nitrate ion
Selenide ion
CrO42BrCO32ClO2N3FOHINO3Se2-
Ionic Compounds Puzzle
Activity
With a partner, you will try to build the
ionic compounds assigned to you.
Things to think about: your completed
compounds should look like
rectangles/squares, and shouldn't have
any open zig zig sides
Writing and Naming Ionic
Compounds
Monday & Wednesday, January 25/27, 2016
Important Vocabulary
Polyatomic
Ions
A covalently bonded group of atoms with a
charge that act as one unit
Chemical
Name
The name of a compound or molecule that
identifies the elements in it
Chemical or
Molecular
Formula
A notation that shows what elements a
compound, or molecule, contains & in what
ratio those elements exist
Superscript
A number written above an element symbol
1(Ex. Cl )
Subscript
The number written below an element symbol
(Ex. H2O)
Compounds
Atoms form compounds to lower the
energy of the atom.
They do this by:
1. filling the outer orbitals
2. emptying the outer orbitals
or
3. sharing electrons to ‘effectively’ Fill
the outer orbitals
Two Types of Compounds - IONIC and MOLECULAR
When two or more atoms fill or empty their valence
shells by the donation or acceptance of electrons, the
atoms are held together by ionic charges (+/-) and they
form an ionic compound. The attractive force that holds
them together is an ionic bond.
Ionic Compounds - ions held by ionic bond
•ALL IONIC COMPOUNDS ARE
NEUTRAL
This means the sum of the charges of
all ions involved must be zero (0)
Making Ionic Compounds = Writing ionic Formulas
Step #1- Cation is written first
Step #2 - All compounds are neutral (sum of
the charges = 0)
Step #3 - Cross over and down!
Step #4- Simplify if necessary
OH
ClFe+3
O-2
PO4-3
Ca+2
NH4+1
Na+1
Example #1
“The Cross Over & Down”
3+
Al
2O
Al2 O 3
2+
Ca
Cl
Ca Cl 2
-
Example #2
Same Charges (SIMPLIFY)
+
Na
Cl
2+
Mg
2O
NaCl
MgO
NaCl
MgO
2
2
2
2
Example #3
“The Cross Over & Down”
Polyatomic Ions
Don’t Forget Parentheses!
3+
Al
2CrO4
3+
Al
2CrO4
Al2 (CrO4) 3 Al2 CrO43
Practice Writing Ionic Compounds:
1/2 Sheet Numbers 11 - 20
Rules for Naming Ionic Compounds:
1. The cation always comes first (dropping the word ‘ion’)
The anion name follows with its characteristic ending
(again droping the word ‘ion’)
Ex) NaCl is an ionic compound made from the Sodium ion
(Na+) and the Chloride ion (Cl-), therefore:
Sodium ion (cation) + Chloride ion (anion)
makes Sodium Chloride
Ex) (NH4)2SO4 is an ionic compound made from the
Ammonium ion (NH4+) and the Sulfate ion (SO4-2),
therefore:
Ammonium ion (cation) + Sulfate ion (anion)
makes Ammonium Sulfate
As always special consideration must be given to transition
metals because of the ‘d’ orbitals. The Roman Numeral that
indicates the charge of the metal must be included in the name
FeSO4 (vs) Fe2(SO4)3
Iron (II) ion + Sulfate ion (vs) Iron (III) ion +
Sulfate ion
Iron (II) Sulfate (vs) Iron (III) Sulfate
It helps to first identify the ions of a compound,
then write the ion names, then finish with the name
of the compound.
Example #4
“The Cheerleader Move”… Figure
Out What You Started With!
2+
Ti
Cl
Ti Cl 2
Titanium (II) chloride
3+
Au
2O
Au2O3
Gold (III) oxide
PRACTICE PROBLEMS: Write the name
a. K2O
b. Na3PO4
c. MgO
d. FePO4
PRACTICE PROBLEMS: Write the name
a. K2O
Potassium Oxide
b. Na3PO4
c. MgO
d. FePO4
Sodium Phosphate
Magnesium Oxide
Iron (III) Phosphate
Practice Naming Ionic Compounds:
1/2 Sheet Numbers 1 - 10