1. Think-Pair-Share
Brainstorm ideas with your neighbor and be prepared to share with the class:
If 28 students have to cut out several tables to glue in their notebooks and there are only 14 scissors, what can the students do?

2. Sharing of electrons (no cations or anions to worry about)
Covalent Bonding
Sharing of electrons
(no cations or anions to worry about)

3. Goal of bonding
Each atom wants an octet (8 electrons in outer most ring/energy level…..8 valence electrons)
Can be achieved by either stealing/giving away electrons or…
By sharing electrons

4. Molecular Formula When sharing electrons, a covalent bond is created.
A molecular compound is formed.
A molecular formula tells how many of each atom is in the compound (just like a chemical formula tells the number of each atom in an ionic bond)

5. Phosphorus trichloride
Note: second atom becomes –ide,
Note: usually nonmetals bonding to a nonmetal.
If a metal is involved, then would be an ionic (+ and -) bond.
Mono di- tri- tell us the number of atoms (chart in planner)

6. Diatomic molecules
Di-atom-ic molecule
Have No Fear Of
Ice Cold Breath

7. Examples: Oxygen gas = O2 Chlorine gas = Cl2 Iodine gas =
Hydrogen gas =

8. Molecular Structure Sometimes call structural formula
Gives the shape of the molecule
Uses electron dot (Lewis dot) formulas
Remember the goal, 8 electrons in the outermost (valence) ring = octet.

9. Dihydrogen monoxide Molecular structure = Shortcut:
Use lines to represent every 2 electrons
Sometimes, paired electrons
left off as well:

10. Phosphorus trichloride
Molecular structure =

11. Chlorine
Molecular structure =

12. Oxygen
Molecular structure =

13. Classwork/Homework
P216 #1-6
P220 #7 and #8
P229 #13-15, 20, 21