Ionic Compounds
Objectives:
• Write chemical
formulas for ionic
compounds
• Name ionic compounds
What is an Ionic Compound
• Compounds that are
formed from the
continuous array of
oppositely charged ions
Monatomic Ions
• Monatomic- one kind or type of
atom
• Monatomic ion- a single
element with the charge of its
valence
Ex: What ion will Na form?
Ex: What ion will S form?
Ex: What ion will Fe form?
NOTE
• Non-Metals and Metalloids in
4A do not participate in ionic
bonding
• The 4A Metals (Tin and Lead)
are +4 since metals
lose electrons
Formulas for Binary Ionic Compounds
• 1 monatomic cation and 1
monatomic anion
BINARY means 2
• Criss Cross can be used
in this case 2
to ensure that
different elements
compounds are
electrically neutral
Criss-Cross
• The Cation is written first
• The Anion is written second
• The charges are crossed over
and written as a subscript for
the other ion
• The signs on charges
are dropped
• Use lowest ratio
EXAMPLE
• Calcium Fluoride
Ca
F
CaF2
NOTE: “ide” simply refers
to a monatomic anion
EXAMPLE
• Lithium Phosphide
P
Li
Li3P
EXAMPLE
• Copper (II) Sulfide
Cu
CuS
S
EXAMPLE
• Zinc Chloride
Zn
Cl
ZnCl2
Naming Binary Ionic Compounds
• Name each ion
Watch out for
• The monatomic anion will
Common Metal
end in “ide”
Ions with More
than One Charge
• ZnS
EXAMPLE
Zinc Sulfide
• BaCl2
EXAMPLE
Barium Chloride
• K2O
EXAMPLE
Potassium Oxide
• CuBr2
EXAMPLE
Copper (II) Bromide
• Fe2S3
EXAMPLE
Iron (III) Sulfide
• SnO2
EXAMPLE
Tin (IV) Oxide
Polyatomic Ions
• Polyatomic- more than one kind
or type of atom
• Polyatomic ion- a group of
tightly bound atoms with a
charge
EXAMPLE
• Lithium Phosphate
Li
PO4
Li3PO4
EXAMPLE
• Iron (II) Sulfate
Fe
SO4
FeSO4
EXAMPLE
• Aluminum Dichromate
Al
Cr2O7
Al2(Cr2O7)3
EXAMPLE
• Ammonium Sulfide
NH4
S
(NH4)2S
EXAMPLE
• Ammonium Hypochlorite
NH4
ClO
NH4ClO
Naming Ternary Ionic Compounds
• Name each ion
Watch out for
• If the anion is
Common Metal
monatomic, it will end in
Ions with More
“ide”
than One Charge
• ZnSO4
EXAMPLE
Zinc Sulfate
EXAMPLE
• Ca(C2H3O2)2
Calcium Acetate
• CuClO2
EXAMPLE
Copper (I) Chlorite
EXAMPLE
• Fe2(CrO4)3
Iron (III) Chromate
• CoSO3
EXAMPLE
Cobalt (II) Sulfite
Page 166 #60, 62, 67