Chemical Bonding
Ionic Compounds
I
II
III
IV
B. Lewis Structures
Ionic – show transfer of e-
Things to know about Ionic
 Ionic compounds are made up of?
 The electrons are being?
 What is written first?
 Opposite charges will?
How to write a formula
Ionic Formulas
Overall net charge must equal zero.
S.O.C.S
Symbols -> Oxidation # -> Crisscross -> Simplify
Don’t show charges in the final formula.
Writing Formula Practice
Potassium Chloride
K+ Cl-

KCl
Aluminum Bromide
Al+3 Br-

AlBr3

BeS = Reduce
Beryllium Sulfide
Be+2 S-2
Ionic Nomenclature
How to Name an Ionic Compound
Write the name of the Cation (Metal)
first. It comes straight off the periodic
table.
Change ending of the Anion
(Nonmetal) to end in -ide.
Naming Practice
Al2O3
Aluminum Oxide
CaS
Calcium Sulfide
Na3P
Sodium Phosphide
Polyatomic Ions
 When you have a compound that
involves more than 2 elements, you must
look at a Polyatomic Chart for help.
 When writing formulas, keep these ions in
parentheses.
 These ions will also have different
endings (-ate) (-ite)
 Helpful for determining between
individual atoms and polyatomic ions
Writing a Formula
 You need to determine if a Polyatomic
Ion is present!
 Look at the ending of the name
 (-ATE) or (-ITE)
 What are some exceptions???
 What if the ending is (-IDE)?
 What will you do then?
Writing Polyatomics
 Potassium Nitrate

KNO3
 Aluminum Sulfide

Al2S3
 Barium Phosphite

Ba3(PO3)2
Naming Polyatomics
 Look for more than two elements. That’s
means a Polyatomic is present.
 Match up the polyatomics and write the
correct names and ending straight from
the chart.
Practice w/ Polyatomics
 CaSO4
Calcium Sulfate
Ga(IO3)3
Gallium Iodate
Writing with Transitions
 When a Transition metal is involved
in the bond, you must identify which
form of the atom is bonding.
 These atoms can have different
oxidation numbers.
 Look for the Roman Numeral in the
name when writing the formula. The
Roman numeral is the oxidation
number of the transition metal.
Practice Writing Trans
 Copper (II) Fluoride
 CuF2
 Zinc (I) Phosphate

Zn3PO4
 Nickel (IV) Oxide

NiO2 (Simplified formula)
Naming Transitions
When Naming the compound, you must
balance the total charge, must be zero!
Look at the Anion. Determine the total
sum of the charge provided by the Anion.
Look at the Cation. Remembering that the
sum of the ionic compound must equal
zero, determine the positive charge, and
roman numeral.
Practice Naming Trans
 Au2S

Gold(I) Sulfide
 Co2O3

Copper(III) Oxide
 AgN

Silver(III) Nitride