1. Use I.U.P.A.C., -ous/-ic, or Greek prefix method
Naming Binary compounds when the first element has more than one valence.
Use I.U.P.A.C., -ous/-ic, or Greek prefix method

2. I.U.P.A.C. Method (Stock method)
Valence of the first element
Name
Hg2O
O -> -2
Hg -> +1
Mercury (I) oxide
HgO
Hg -> +2
Mercury (II) oxide
FeCl3
Cl -> -1
Fe -> +3
Iron (III) chloride

3. The valence of the first element is indicated by a Roman numeral in brackets following the name of the element.

4. Write the formula for: Antimony (III) chloride Arsenic (V) sulphide
Sb3+ Cl –
SbCl3
Arsenic (V) sulphide
As5+ S2–
As2S5

5. -ous/-ic Method
1. Use –ous ending if first element has a lower valence
2. Use –ic ending if first element has a higher valence

6. Name the following Example 1: MnO Mn -> +2 O -> -2
Mn can be +2 or +4
- manganous oxide

7. Example 2: MnO2 Manganic oxide Example 3: N2O3 Mn -> +4 O -> -2
N can be +3 or +5
Nitrous oxide

8. In this method, the following elements are named in Latin:
Copper cuprous (+1) cupric (+2)
Iron ferrous (+2) ferric (+3)
Tin stannous (+2) stannic(+4)
Lead plumbous (+2) plumbic(+4)

9. Name the following: Ferrous chloride Cupric oxide FeCl2 CuO

10. Write the formula for: Example 1: mercuric oxide HgO
the higher valence for mercury is +2, oxygen is –2
HgO
Example 2: ferrous oxide
The lower valence for iron is +2, sulphur is –2
FeS

11. Greek Prefix:Use a greek prefix to indicate how many atoms are in the compound
MONO DI
TRI
TETRA
PENTA
HEXA
HEPTA
OCTA
NONA
DECA

12. Name the following: Example 1: SO2
monosulphur dioxide -> sulphur dioxide
Example 2: Al2O3
dialuminum trioxide
Example 3: H2O
dihydrogen monoxide

13. Write the formula for: Example 1: dinitrogen difluoride N2F2
Example 2: diphosphorus pentoxide
P2O5
Example 3: carbon monoxide CO

14. Homework: 1. Complete handout page 4 from booklet
2. Page 103 #21 a, b, e, f
3. Page 105 #24
4. Page 106 #2
5. Page 108 #19 a, b, c, e, f