1. Chapter 9: Chemical Names and Formulas
Naming ions
Naming and writing formulas for ionic compounds

2. Learning Targets You will:
Determine the name and/or formula of an ionic compound.
Know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

3. You will determine the name and/or formula of an ionic compound.
Nomenclature
Nomenclature is the language of chemistry – it’s how we read and write.
Ionic compounds consist of a positive metal ion (cation) and a negative nonmetal ion (anion) combined in the simplest whole number proportion so the charges add up to a net charge of zero.
It’s important to learn about the ions that form ionic compounds.
For example, the ionic compound sodium chloride (NaCl) consists of one sodium ion (Na +) and one chloride ion (Cl –).
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

4. Ions Ions Monatomic Loses electrons Name is cation name
Single atom with positive charge
Loses electrons
Name is cation name
Single atom with negative charge
Gains electrons
Name is root or stem plus -ide
Polyatomic
More than one atom with a charge
Name is polyatomic ion name
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

5. You will determine the name and/or formula of an ionic compound.
Ions
Bisulfite (hydrogen sulfite)
Bisulfate (hydrogen sulfate)
Bicarbonate (hydrogen carbonate)
Acetate (ethanoate)
ammonium nitrate sulfate phosphate
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

6. You will determine the name and/or formula of an ionic compound.
Helpful tip
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

7. Metals that form more than one ion
Metals NOT in group 1, 2 or 3
Roman numeral necessary = charge on individual cation; comes AFTER cation name
Few with one ionic charge (similar to groups 1-3)
Silver, Ag
Cadmium, Cd
Nickel, Ni
Zinc, Zn
Old system name
- ous: lower charge on cation
- ic: higher charge on cation
Can memorize OR calculate using the anion charge
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

8. Writing formulas for ionic compounds
Write the formula symbols
Assign the charges
KNOW YOUR ION CHARGES
Roman numeral = charge on cation
Sum the charges to a net charge of zero (a MUST for ionic compounds) and apply as subscripts.
Subscript = # of each ion so NO charge
IF a subscript is needed for the polyatomic ion, put the polyatomic ion in PARENTHESES with the subscript outside of it.
Be sure ions are in simplest whole number ratio.
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

9. Naming ionic compounds
The cation is named first and comes from its element or polyatomic ion name.
If your cation is not in groups 1-3, use a roman numeral after it to indicate the charge.
The anion is named second and is named by taking the root of its element name and adding –ide or from the polyatomic ion name .
NO PREFIXES!!!
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

10. You will determine the name and/or formula of an ionic compound.
Examples
Name or write the formula for each ionic compound:
CsF
Na2SO4
CuCl
PbBr2
Magnesium iodide
Calcium hydroxide
Lead (IV) chloride
Iron (II) hydroxide
Answers:
Cesium fluoride
Sodium sulfate
Copper (I) chloride
Lead (II) bromide
MgI2
Ca(OH)2
PbCl4
Fe(OH)2
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

11. You will determine the name and/or formula of an ionic compound.
Examples again
Name or write the formula for each ionic compound:
AlCl3
Fe2O3
KH2PO4
FeS
Sodium chloride
Sodium phosphate
Tin (IV) oxide
Lead (II) carbonate
Answers:
Aluminum chloride
Iron (III) oxide
Potassium dihydrogen phosphate
Iron (II) sulfide
NaCl
Na3PO4
SnO2
PbCO3
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

12. You will determine the name and/or formula of an ionic compound.
Try on your own
Name or write the formula for each ionic compound:
Rb2O
KHSO4
Fe(NO3)3
Mn(OH)2
Potassium sulfide
Sodium cyanide
Mercury (II) oxide
Cobalt (II) perchlorate
Answers:
Rubidium oxide
Potassium hydrogen sulfate
Iron (III) nitrate
Manganese (II) hydroxide
K2S
NaCN
HgO
Co(ClO4)2
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

13. You will determine the name and/or formula of an ionic compound.
Try on your own again
Name or write the formula for each ionic compound:
SrI2
NH4I
Cu(NO3)2
Magnesium bromide
Calcium hydrogen carbonate
Potassium permanganate
Cobalt (III) chloride
Copper (II) nitrite
Answers:
Strontium iodide
Ammonium iodide
Copper (II) nitrate
MgBr2
Ca(HCO3)2
KMnO4
CoCl3
Cu(NO2)2
You will determine the name and/or formula of an ionic compound.
You will know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.

14. SUMMARIZE
You will:
Determine the name and/or formula of an ionic compound.
Know the formula and name for common polyatomic ions and incorporate these ions in naming and constructing formulas.