• Must be neutral overall
• Name the cation first, then the anion
• Cation is either a metal or ammonium
• To name a metal cation, use the element name and a roman numeral to indicate the charge of the cation
• Tin(II) is Sn 2+
• Tin(III) is Sn 3+
• Mercury(II) is Hg 2+
• Mercury(I) is Hg
2
2+ (it’s diatomic)
• Roman numerals are NOT used for the following because they only have one charge: Group 1A (+1), Group 2A(+2), ammonium(+1), or
CdZnAgAl 2213 (where 2 is the charge of Cd, 2 is the charge of Zn, etc.)
• Sodium is Na +
• Magnesium is Mg 2+
• Cadmium is Cd 2+

• Anion is either a nonmetal or a negative polyatomic ion
(like sulfate or phosphite)
• Use the ion name for the nonmetal (Cl is chloride)
• Some examples for you to look at before we practice
• Zr(NO
3
)
2
= zirconium(II) nitrate
• Since nitrate has a -1 charge and there are 2 of them, zirconium must have a +2 charge to make the compound neutral overall
• CuCl = copper(I) chloride
• CuCl
2
= copper(II) chloride
• the # of Cl depends on the charge of Cu ion
• Ag
3
PO
4
= silver phosphate (no roman numerals because this is part of CdZnAgAl 2213)

A does #1 and B checks, B does #1 and A checks
A does #2 and B checks, etc.
 the answers will be displayed when everyone is done
These are A’s problems
(B will check them)
1. Au(ClO)
2
2. MgO
3. Fe
2
S
3
4. AlN
These are B’s problems
(A will check them)
1. CoP
2. Ag
2
CO
3
3. Ca(CN)
2
4. PbF
2
If there are groups of 3, just rotate A, B, and C
Hint: each set has 2 that need roman numerals and 2 that do not

These are A’s problems
(B will check them)
1. Au(ClO)
2 gold(II) hypochlorite
2. MgO magnesium oxide
3. Fe
2
S
3 iron(III) sulfide
4. AlN aluminum nitride
These are B’s problems
(A will check them)
1. CoP cobalt(III) phosphide
2. Ag
2
CO
3 silver carbonate
3. Ca(CN)
2 calcium cyanide
4. PbF
2 lead(II) fluoride

(but ask your partner if you need help)
Careful: I mixed in some covalent….
1. FeSO
4
2. (NH
4
)
2
CrO
4
3. NI
3
4. Fe(HCO
3
)
3
5. Co(C
2
H
3
O
2
)
3
6. Y(OH)
2
7. FeBr
3
8. SO
3
9. ZnSO
3
1. iron(II) sulfate
2. ammonium chromate
3. nitrogen triodide
4. iron (III) bicarbonate
5. Cobalt(III) acetate
6. yttrium(II) hydroxide
7. Iron(III) bromide
8. sulfur trioxide
9. zinc sulfite