1. Binary Covalent Compounds

2. Covalent bond atoms share electrons
Definition
Covalent bond atoms share electrons
Binary Covalent Compound compound made from two non-metals that share electrons
Non
metal
Non
metal
Covalent compound

3. Identifying Binary Covalent Compounds
These compounds have:
2 elements (“binary”)
Both non-metals (“covalent”)

4. Diatomic Elements

6. The Appendix of your book (Page A-2) has the following chart
Covalent Prefixes
The Appendix of your book (Page A-2) has the following chart
PREFIXES USED IN MOLECULAR COMPOUNDS
mono-
di-
tri-
tetra-
penta-
hexa-
hepta-
octa-
nona-
deca-

7. Naming Covalent Compounds
Look at the subscript of the first element
If the subscript is an assumed one then just name the element
If the subscript is greater than one then use the prefix to denote the number of atoms present then name the element
Look at the subscript of the second element
Use a prefix to denote the number of atoms present, then name the element with an –ide ending.

8. Example #1
P2O5

9. P2O5 Diphosphorus pentaoxide Example #1 Phosphorus Oxygen 2 = “di-”
Use “-ide”
Diphosphorus pentaoxide

10. Example #2
SiO2

11. SiO2 Silicon dioxide Example #2 Silicon Oxygen
Don’t use “mono-” on first element
Silicon
SiO2
Oxygen
2 = “di-”
Use “-ide”
Silicon dioxide

12. Write the name for the following compounds
Let’s Practice
CO2
N2O4
P4O10 CO
Example:
Write the name for the following compounds

13. Write the name for the following compounds
Let’s Practice
CO2
N2O4
P4O10 CO
Carbon dioxide
Dinitrogen tetraoxide
Tetraphosphorus decaoxide
Carbon monoxide
Example:
Write the name for the following compounds

14. Writing Formulas for Binary Covalent
To write these formulas:
Write down the symbol of the first element. After that symbol place a subscript. The subscript is determined from the prefix. Assume the first element is “1” if there is no prefix.
Repeat this for the last element.
Atoms do not form charges when bonding covalently…you DO NOT need to worry about balancing charges with this type!
THESE ALL END IN -IDE

15. Dinitrogen Tetraoxide
Example #1
Dinitrogen Tetraoxide

16. Example #1
“Di-” = 2 N
Dinitrogen Tetraoxide O
“Tetra-” = 4
N2O4

17. Example #2
Silicon dioxide

18. Silicon dioxide SiO2 Example #2 Si O
“Mono-” is not written for the first element Si
Silicon dioxide O
“Di-” = 2
SiO2

19. Write the following chemical formulas
Let’s Practice
Carbon monoxide
Nitrogen dioxide
Diphosphorus pentaoxide
Example:
Write the following chemical formulas

20. Write the following chemical formulas
Let’s Practice
Carbon monoxide
Nitrogen dioxide
Diphosphorus pentaoxide CO
NO2
P2O5
Example:
Write the following chemical formulas