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Ionic Nomenclature
• Must be neutral overall
• NO PREFIXES!!!!!!
• 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 Sn2+
Tin(III) is Sn3+
Mercury(II) is Hg2+
Mercury(I) is Hg22+ (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 Mg2+
• Cadmium is Cd2+
Ionic Nomenclature
• 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(NO3)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
• CuCl2 = copper(II) chloride
• the # of Cl- depends on the charge of Cu ion
• Ag3PO4 = silver phosphate (no roman numerals because
this is part of CdZnAgAl 2213)
Work with your shoulder partner –
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)
These are B’s problems
(A will check them)
1.
2.
3.
4.
1.
2.
3.
4.
Au(ClO)2
MgO
Fe2S3
AlN
If there are groups of 3,
just rotate A, B, and C
CoP
Ag2CO3
Ca(CN)2
PbF2
Hint: each set has 2 that need roman
numerals and 2 that do not
Answers
These are A’s problems
(B will check them)
These are B’s problems
(A will check them)
1. Au(ClO)2
gold(II) hypochlorite
2. MgO
magnesium oxide
3. Fe2S3
iron(III) sulfide
4. AlN
aluminum nitride
1. CoP
cobalt(III) phosphide
2. Ag2CO3
silver carbonate
3. Ca(CN)2
calcium cyanide
4. PbF2
lead(II) fluoride
Work these on your own –
(but ask your partner if you need help)
Careful: I mixed in some covalent….
1. FeSO4
1. iron(II) sulfate
2. (NH4)2CrO4
2. ammonium chromate
3. NI3
3. nitrogen triodide
4. Fe(HCO3)3
4. iron (III) bicarbonate
5. Co(C2H3O2)3
5. Cobalt(III) acetate
6. Y(OH)2
6. yttrium(II) hydroxide
7. FeBr3
7. Iron(III) bromide
8. SO3
8. sulfur trioxide
9. ZnSO3
9. zinc sulfite

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