• The International Union of Pure and
Applied Chemistry (IUPAC) created a
system of naming compounds.
• This system of naming chemical
compounds is called nomenclature.
• Creates a worldwide system (like S.I.
• There are three “types” of naming, each
defined by where the first ion in the
compound is located.
• These are called “pink” “green” or “blue”
sections by the color of the section.
• They could also be considered S, D or P
respectively based on electron orbital.
• When the first ion is from the pink section,
say the whole name of the first ion, and
replace the end of second with –ide.
• Ex: NaCl = Sodium Chloride
• Ex: MgF2 = Magnesium Fluoride
• Ex: K2O = Potassium Oxide
What is the formula for Li3N
A.) Lithium Nitride
B.) Trilithium Nitrogen
C.) Lithium (III) Nitride
D.) Lithium Trinitride
What is the name for CaO?
A.) Carbon Monoxide
B.) Calcium Oxygen
C.) Calcium Oxide
D.) Carbon Oxide
• The ions in the green section can have
• Therefore we have to discern their
charges with some deduction.
• Ex: CuO . . Copper must have a charge of
+2 here, because it has a 1 to 1 ratio with
O that has a charge of -2.
• CuO continued. . .
• Since Copper has a charge of +2, you
write the name as Copper (II) Oxide.
• Ex: Fe2O3 must have a charge of +3.
Therefore it is Iron (III) Oxide.
• Ex: FeO is Iron (II) Oxide.
What is the formula for Manganese
What is the name for SnO2
A.) Tin (II) Oxide
B.) Tin (IV) Oxide
C.) Tin Oxide
D.) Tin Oxide (II)
• If you haven’t noticed, the last ion is
always negatively charged (blue).
• When both are from the blue, it is a
• Since these can occur in many ways, we
have to specify how many of each atom
are in the compound.
1 – Mono 2 – Di
3 – Tri 4 – Tetra
5 – Penta 6 – Hexa
7 – Hepta 8 – Octa
9 – Non 10 - Deca
• Simply use the appropriate prefix to
describe how many atoms are present.
• The only rule is: Don’t put mono on the
• Ex: N2O4 Dinitrogen Tetroxide
• Ex: CO2 Carbon Dioxide
What is the name of P4O6?
A.) Phosphorus Dioxide
B.) Phosphorus (IV) Oxide
C.) Triphosphorus Pentoxide
D.) Tetraphosphorus Hexoxide
What is the formula for Trinitrogen
• Sometimes multiple atoms come together
to form a single ion.
• These polyatomic ions can then bond with
other ions to form compounds.
• Follow the previous rules for naming.
• Ex: NaNO3 Sodium Nitrate
• Ex: CaSO4 Calcium Sulfate
• Ex: FePO4 Iron (III) Phosphate
• Ex: Ca(ClO3)2 Calcium Chlorate
1. If first ion is in pink write its element
name and replace the end of the second
2. If first ion is in green, only use roman
numerals to depict its charge. I, II, III, IV,
3. If first ion is in blue, then use the
scientific prefixes: di, tri, tetra…..