1. Warm Up CaO NaF MgCl2 K2O Al2S3
Draw Lewis Dot Diagrams for the following ionic compounds:
CaO
NaF
MgCl2
K2O
Al2S3

2. Ionic Formulas and Naming
Unit Five, Day One
Kimrey
11 March 2013

3. Formulas for Ionic Compounds
Ionic compounds will bond in a ratio that cancels their ion charge
ALL compounds no matter what are neutral

4. Steps for Writing Formulas
Find the charges of the elements.
Find the simplest ratio needed to cancel out the charges.
Write the ratio numbers as subscripts (ones do not get written!)
Write the positive ion first followed by the negative ion. Make sure not to write the charges of the ions in the formula.

5. Those pesky polyatomics.
Polyatomic is a group of bonded atoms that still has a charge.
Same steps as binary compounds plus…
5. If a subscript is added to a polyatomic ion place the entire polyatomic in ().
REMEMBER! Never ever change the subscripts in a polyatomic ion.

6. Examples Sodium and Hydroxide (OH-1) NaOH Lithium and sulfate (SO4-2)
Li2SO4
Calcium and phosphate (PO4-3)
Ca3(PO4)2
Ammonium (NH4+1) and fluorine
NH4F

7. Naming of Ionic Compounds – 3 different types!
Binary Compounds - Write the name of the first element then write the beginning of the second element plus –ide
Example: NaCl = Sodium Chloride
CaS
MgF2

8. Type #2
Polyatomic compounds – Write the name of the first element plus the name of the polyatomic ion.
Example: CaSO4 = Calcium Sulfate
NaOH
Mg(NO3)2

9. The last kind…
Transition metal compounds – Write the name of the first element with the oxidation number (charge) in parenthesis then write the beginning of the second element plus –ide.
Example: PbO = Lead (II) Oxide
Mn2S
Y3N2

10. Tips
Anions (nonmetal ions) are the element names with –ide at the end.
ex. Chloride, oxide, and fluoride
Polyatomic ions never change their names.
Metals not in column 1 or 2 must have roman numerals to show their charge.

11. Examples
NaCl
CuO
LiOH
PbSO4
Ca(NO3)2
Fe2O3

12. Review PbF2 Lead (II) Fluoride CuCl3 Copper (III) Chloride FePO4
Iron (III) Phosphate
Ni(NO3)2
Nickel (II) Nitrate

13. Practice Name The Following Fe(OH)3 Iron (III) Hydroxide CoSO4
Cobalt (II) Sulfate
NiF2
Nickel (II) Fluoride
CuNO3
Copper (I) Nitrate
Ca(OH)2
Calcium hydroxide
Write the formulas for…
Manganese (II) Nitrate
Mn(NO3)2
Yttrium (III) Chloride
YCl3
Nickel (II) Sulfate
NiSO4
Magnesium Bromide
MgBr2
Lead (IV) Sulfate
Pb(SO4)2

14. Correct the following Names and write the formula
Magnesium (II) Sulfate
Magnesium Sulfate; MgSO4
Iron dichloride
Iron (II) Chloride; FeCl2
Lead (IV) disulfide
Lead (IV) Sulfide; PbS2
Potassium Hydroxide
 ; KOH