This document provides information on naming ionic and molecular compounds. It discusses how to name ionic compounds containing two elements by identifying the cation and anion. It also discusses how to name compounds containing transition metals with variable charge by including the ionic charge in Roman numerals. The document shows examples of writing formulas from compound names and vice versa. It introduces molecular compound naming using prefixes to indicate the number of atoms of each element. Finally, it discusses naming polyatomic ions based on their chemical formulas.

1. 1
Compounds and Their Bonds
Naming and Writing Ionic
Formulas
Copyright © 2005 by Pearson Education, Inc.
Publishing as Benjamin Cummings

2. 2
Naming Ionic Compounds with Two
Elements
To name a
compound that
contains two
elements,
• identify the cation
and anion.
• name the cation first
followed by the
name of the anion.

3. 3
Charges of Representative
Elements
Copyright © 2005 by Pearson Education, Inc.
Publishing as Benjamin Cummings

4. 4
Names of Some Common Ions
Copyright © 2005 by Pearson Education, Inc.
Publishing as Benjamin Cummings

5. 5
Complete the names of the following ions.
Ba2+ Al3+ K+
_________ __________ _________
N3 O2 F
_________ __________ _________
P3 S2 Cl
_________ __________ _________
Learning Check

6. 6
Ba2+ Al3+ K+
barium aluminum potassium
N3 O2 F
nitride oxide fluoride
P3 S2 Cl
phosphide sulfide chloride
Solution

7. 7
Formula Ions
cation anion
NaCl Na+ Cl- sodium chloride
K2S K+ S2- potassium sulfide
MgO Mg2+ O2- magnesium oxide
CaI2 Ca2+ I- calcium iodide
Al2O3 Al3+ O2- aluminum oxide
Examples of Ionic Compounds with
Two Elements

8. 8
Write the names of the following compounds.
1) CaO ___________
2) KBr ___________
3) Al2O3 ___________
4) MgCl2 ___________
Learning Check

9. 9
Write the names of the following compounds:
1) CaO calcium oxide
2) KBr potassium bromide
3) Al2O3 aluminum oxide
4) MgCl2 magnesium chloride
Solution

10. 10
Learning Check
Write the formulas and names for compounds of the
following ions:
Br− S2− N3−
Na+
Al3+

11. 11
Solution
Br− S2− N3−
Na+
Al3+
NaBr
sodium
bromide
Na2S
sodium
sulfide
Na3N
sodium
nitride
AlBr3
aluminum
bromide
Al2S3
aluminum
sulfide
AlN
aluminum
nitride

12. Review St. John
NaBr
Na2S
Na3N
12

13. 13
Transition Metals form Positive Ions
Most transition metals and Group 4(14) metals form 2
or more positive ions.
Zn2+, Ag+, and Cd2+ form only one ion.

14. 14
Metals that form more than One
Cation
The name of metals with two or more positive ions
(cations) use a Roman numeral to identify ionic charge.
Copyright © 2005 by Pearson Education, Inc.
Publishing as Benjamin Cummings
Lead Pb2+ lead(II)
Pb4+ lead(IV)

15. Element Stock Name Latin Name
Copper Copper (I) Cuprous
Copper (II) Cupric
Iron Iron (II) Ferrous
Iron (III) Ferric
Lead Lead (II) Plumbous
Lead (IV) Plumbic
Mercury Mercury (II) Mercurous (Hg2)
Mercury (II) Mercuric
Tin Tin (II) Stannous
Tin (IV) Stannic
15
Gold Gold (I) Aurous
Gold (III) Auric
Chromium Chromium (II) Chromous
Chromium (III) Chromic

16. 16
Naming Ionic Compounds with
Variable Charge Metals
Copyright © 2005 by Pearson Education, Inc.
Publishing as Benjamin Cummings

17. 17
Naming Variable Charge Metals
Transition metals
with two different
ions use a Roman
numeral after the
name of the metal
to indicate ionic
charge.

18. 18
Learning Check
Select the correct name for each.
A. Fe2S3
1) iron sulfide
2) iron(II) sulfide
3) iron(III) sulfide
B. CuO
1) copper oxide
2) copper(I) oxide
3) copper(II) oxide

19. 19
Solution
Select the correct name for each.
A. Fe2S3
3) iron (III) sulfide Fe3+ S2-
B. CuO
3) copper (II) oxide Cu2+ O2-

20. 20
Guide to Writing Formulas from the
Name
Copyright © 2005 by Pearson Education, Inc.
Publishing as Benjamin Cummings

21. 21
Writing Formulas
Write a formula for potassium sulfide.
1. Identify the cation and anion.
potassium = K+
sulfide = S2−
2. Balance the charges.
K+ S2−
K+
2(1+) + 2(1-) = 0
3. 2 K+ and 1 S2− = K2S

22. 22
Writing Formulas
Write a formula for iron(III) chloride.
1. Identify the cation and anion.
iron (III) = Fe3+ (III = charge of 3+)
chloride = Cl−
2. Balance the charges.
Fe3+ Cl−
Cl− = (3+) + 3(1-) = 0
Cl−
3. 1 Fe3+ and 3 Cl− = FeCl3

23. 23
Learning Check
What is the correct formula for each of the following?
A. Copper(I) nitride
1) CuN 2) CuN3 3) Cu3N
B. Lead(IV) oxide
1) PbO2 2) PbO 3) Pb2O4

24. 24
Solution
The correct formula is
A. Copper (I) nitride
3) Cu3N Need 3Cu+ and N3-
B. Lead (IV) oxide
1) PbO2 Need Pb4+ and 2O2-

25. Naming Molecular Formula
Prefixes Equivalent
mono 1
di 2
tri 3
tetra 4
penta 5
hexa 6
hepta 7
octa 8
nona 9
deca 10
25

26. example
 N2O
 ICl3
 UF6
 N2O3
 CO
 H2O
 boron trichloride
 diarsenic trisulfide
 diphosphorous pentoxide
 nitrogen triphosphide
26

27. Learning Check A: Write the Molecular
Name of the ff. compounds
1. P4S3
2. PBr3
3. NO2
4. CO2
5. CF4
6. SiO2
7. PCl3
8. N2O5
9. SF6
10. SO2
27
1. tetraphosphorus trisulfide
2. phosphorus tribromide
3. nitrogen dioxide
4. carbon dioxide
5. carbon tetrafluoride
6. silicon dioxide
7. phosphorus trichloride
8. dinitrogen pentoxide
9. sulfur hexaflouride
10.sulfur dioxide

28. Learning Check B: Write the Molecular
Formula of the ff. compounds
 1) Silicon tetrafluoride
 2) Dinitrogen monoxide
 3) Sulfur trioxide
 4) Iodine pentafluoride
 5) Tetraphosphorus trisulfide
 6) Nitrogen monoxide
 7) Nitrogen tetraoxide
 8) Antimony pentafluoride
 9) Carbon disulfide
 10)Carbon tetraiodide
28

29. Polyatomic Ions
 H+ PO4
3-
H3 PO4
hydrogen phosphate
 Mg2+ PO4
3-
Mg3 (PO 4) 2
magnesium phosphate
 Ca2+ OH -
Ca(OH) 2
calcium hydroxide
29

30. 30

31. Direction: Write the name of the polyatomic ion with the
formula…:
1. SO3
2-
2. SO4
2-
3. PO4
3-
4. OH -
5. NO3
-
6. NO2
-
7. NH4
+
8. MnO4
-
9. IO3
-
10. IO2
-
11. HSO4
-
12. HCO3
-
13. CO3
2-
14. CN –
15. ClO4
-
16. ClO3
-
17. ClO2
-
18. ClO -
19. C2H3O2
20. BrO4
-
31

32.  Write the formulas for the following:
1. Sodium chloride
2. Mercury (I) iodide
3. Ferrous bromide
4. Barium nitride
5. Magnesium fluoride
6. Cadmium oxide
7. Manganese sulfide
8. Lithium iodide
9. Chromium (II) nitride
10. Calcium oxide
32

33. Directions: Write the formula for the following:
1. Sodium chloride
2. Lead (II) iodide
3. Ferrous bromide
4. Barium nitride
5. Magnesium fluoride
6. Cadmium oxide
7. Manganese sulfide
8. Lithium iodide
9. Chromium (II) nitride
10. Calcium oxide
11. Zinc chloride
12. Silver iodide
13. Aluminum oxide
14. Silver sulfide
15. Cadmium bromide
16. Ferric oxide
17. Sodium sulfide
18. Silver bromide
19. Potassium sulfide
20. Strontium chloride
33

34. Directions: Write the Chemical Name for the following:
1. CuO
2. CrCl2
3. PbS
4. CoN
5. CuS
6. Sn3P2
7. PbO2
8. HgCl2
9. FeO
10. CuF
34