1. Formula – is shorthand representation of a compound
Kinds of
Compound
Binary
Ternary
Made up of 2
kinds of atoms
Only and whose
name ends in
ide
Made up of
more than 2
kinds of atoms
and whose
name ends in
ate or ite
are
H2O
dihydrogen monoxide
NaCl
sodium chloride
H2SO4
hydrogen sulfate
KNO2
potassium nitrite

2. Na
+1
Cl
-1
NaCl
Al
+3
O
-2
+6 -6 LCM
Al O
Total Positive Charge = Total Negative Charge
of pertinent ions
Formula Writing
concept is
2 3

3. IA +1
IIA +2
IIIA +3
IV A +4/-4
VA -3
VI A -2
VII A -1
FIXED CHARGES
VARYING CHARGES
Cu +1 / Cu +2
Fe +2 /Fe+3 Sb +3/ Sb +5
Name the metal and add ion
Name the metal and the charge in roman number
Enclosed in a parenthesis and add ion
Root name
Of non metal
And ends in
Ide and add ion
When in
binary
systems

4. Tools :
Periodic Table
• of ions with fixed charges =
give name of the metal and
add the word “ion”
• Na +1 sodium ion
Al +3 aluminum ion
• Of ions with varying charges
= give root name of metal
and ends in “ic” for the
higher charge, ends in “ous”
for the lower charge
• Cu+1 cuprous ion
Cu+2 cupric ion

5. Of ions with varying charges
• = give root name of metal
and ends in “ic” for the
higher charge, ends in “ous”
for the lower charge
• Cu+1 cuprous ion
• Cu+2 cupric ion
• Give name of metal
followed by its appropriate
charge in Roman number
enclosed in a parenthesis
•
• Cu+1 copper (I) ion
• Cu+2 copper (II) ion

6. Tools :
Table of Radicals
• Radicals = ions made
up of several kinds of
atoms behaving as
single ions

7. Kinds of Compounds
• 1. Binary Compounds = compounds made up of only 2 kinds of
atoms = names end in “ide”
Mono positive ion with mono negative ion
• 2. Ternary Compounds = compounds made up of more than 2 kinds
of atoms
= names end in “ate” or ”ite”
• Mono positive ion with negative radical
• 3. Binary compounds made up of 2 non metals

8. Naming of Compounds
Positive ion Negative ion
Acid H
Salt Any metal
Base OH

9. Acids Without oxygen With Oxygen (oxy acid)
Aqueous acid Add the word “hydro”
before root name of
characteristic element
and ends I “ic”
H2S hydrosulfuric acid
Give name of
characteristic element
and ends in “ic” for the
higher number of O
atoms, ends in “ous”for
the lower number of O
atoms
H2SO4 sulfuric acid
H2SO3 sulfurous acid
Pure state acid Add the word “hydrogen” before the name of the
negative ion
H2S hydrogen sulfide
H2SO4 hydrogen sulphate
H2SO3 hydrogen sulphite

10. salt Give the name of the
positive ion with “
appropriate ending”
followed by the name of
the negative ion
CaCl2 calcium chloride
FeCl3 Ferric chloride
Iron (III) chloride
CuSO4 copper (II) sulphate

11. base Give the name of the positive
ion with “ appropriate
ending” followed by “
hydroxide” ( the name of the
negative ion)
Al(OH)3 Aluminum hydroxide
Cu(OH)2 copper (II) hydroxide

12. Binary compounds made up of
2 non metals
Give the names of the 2 non
metals and end in “ide”. Use
appropriate prefixes to
indicate the number of non
metals. If the number of the
first non metal is 1, no need to
use the prefix “mono”.
P2O5 diphosphorous penta
oxide
CO carbon monoxide
CCl4 carbon tetrachloride

13. Hydrates-salts
containing some
water molecules
Give the name of the salt
followed by the name
“hydrate”. Use appropriate
prefixes to indicate the
number of water
molecules.
CuSO4 5 H2O copper (II)
sulphate penta hydrate