1. BELLWORK 12/07/15
Draw the Lewis Structure for NH3 using lines for the shared electron pairs.
Draw the Lewis Structure for CO2
Draw the Lewis Structure for CO2?

2. Double Covalent Bonds
Sometimes atoms attain noble gas configuration by sharing 2 or 3 pairs of electrons
A Double Covalent Bond is a bond that involves 2 shared pairs of electrons (4 e-)

3. Triple Covalent Bond
A Triple Covalent Bond is a bond that involves 3 shared pairs of electrons (6 e-)

4. 7.3 Naming Covalent Compounds and Writing Formulas

5. Naming Covalent Compounds
The system of naming covalent compounds is based on the use of prefixes.

6. Prefixes-stand for the amount of atoms present
1-- mono
2-- di
3-- tri
4-- tetra
5-- penta
6-- hexa
7-- hepta
8-- octa
9-- nona
10-- deca

7. 2 Steps to Naming and Writing Molecular Compounds with Covalent Bonds
Name the first non-metal.
The first non-metal only gets a prefix if there is more than one atom.
Name the second non-metal using the correct prefix and an “ide” ending
*The second non-metal always receives a prefix.

8. EXAMPLES
CO2 – carbon dioxide
N2O5 – Dinitrogen pentoxide

9. You try . . .
Cl2O
Dichlorine monoxide

10. Carbon Monoxide CO
Phosphorus
Trichloride
PCl3
CI4
Carbon Tetriodide

11. Writing The Molecular Formulas:
Phosphorous
Trichloride
PCl3

12. Trinitrogen N3
Carbon
Tetrachloride
CCl4

13. Classwork / Homework
Covalent Wksht #3