1. Naming and Formula Writing

2. Covalent Compounds Naming Rules
Subscripts tell how many atoms of each element there is
Use prefixes in front of the name to denote the subscript:
mono: hexa: 6
di: hepta: 7
tri: octa: 8
tetra: nano: 9
penta: deca: 10
The second name ends in -ide

3. Covalent Compounds Naming Examples Nitrogen dioxide
NO2 –
Mono is only used in the second part of the name.
N2O3 –
Nitrogen dioxide
Dinitrogen trioxide

4. Covalent Compounds Formula Writing Write the symbols of the elements
Write the subscripts for each element from the prefix

5. Covalent Compounds Formula Examples N2O5 SiBr4 Dinitrogen pentoxide –
Silicon tetrabromide –
N2O5
SiBr4

6. Ionic Compounds Naming Rules
Cation is named first (metal) – keep original name
E.g.: Mg+2 is Magnesium
Anion is named second (non-metal)- ending of the name is replaced with –ide
E.g.: Cl-1 is Chloride

7. Ionic Compounds Naming Examples Sodium sulfide Aluminum Chloride
Na2S –
AlCl3 –
Sodium sulfide
Aluminum Chloride

8. Ionic Compounds Formula Writing Rules
Write the symbols of the elements in the compound starting with the metal.
Determine the charge of each ion.
Select the subscripts that will create a neutral compound.
Put the metal with the non-metal together.

9. Ionic Compounds Formula Examples K3N Calcium Fluoride 1. Ca F
Potassium Nitride –
K3N

10. Transition Metals Naming Rules
Cation is named first (metal) – keep original name
E.g.: Fe+3 is Iron
Determine the charge of the transition metal and the charge becomes a roman numeral after the name.
looking at the subscript of the non-metal and make that the charge of the transition metal
Anion is named second (non-metal)- ending of the name is replaced with –ide
E.g.: Cl-1 is Chloride

11. Transition Metals Naming Examples Mangenese (II) flouride
MnF2 –
NiS –
Mangenese (II) flouride
Nickel (II) sulfide

12. Transition Metals Formula Rules
Write the symbols of the elements in the compound starting with the metal.
Determine the charge of each ion.
The roman numeral in the parentheses is the charge for the transition metal.
Select the subscripts that will create a neutral compound.
Put the Metal with the non-metal together.

13. Transition Metals Formula Examples Cr2S3 Fe3N2
Chromium (III) Sulfide –
Iron (II) nitride –
Cr2S3
Fe3N2

14. Polyatomic Ions Naming Rules
An ion that contains two or more non-metals bonding with a metal.
Cation is named first (metal) – keep original name
E.g.: Mg+2 is Magnesium
Polyatomic ion is named second
Refer to your chart for the name.
E.g.: CO3-2 is carbonate

15. Polyatomic Ions Naming Examples Potassium phosphate Sodium Hydroxide
K3PO4 –
NaOH –
Potassium phosphate
Sodium Hydroxide

16. Polyatomic Ions Formula Rules
Write the symbols of the elements in the compound starting with the metal
Determine the charge of each ion, use the chart for the polyatomic ion
Select the subscripts that will create a neutral compound.
Use parentheses around the polyatomic ion if more than one polyatomic is required.

17. Polyatomic Ions Formula Examples (NH4)2SO4 LiNO3 Ammonium Sulfate –
Lithium Nitrate –
(NH4)2SO4
LiNO3