1. Bonding
Ch 7 & 8

2. Ionic Need to know Valence electrons Octet rule Cations Anions
Ionic compounds
Obviously, you need both a cation and an anion to create one of these…remember, net charge = 0.

3. Ionic compounds
Chemical formula: the kinds and #s of atoms that make up the smallest unit of a substance/cpd.
Formula unit: lowest whole number ratio of the atoms making up a cpd.
Properties: brittle, crystalline solids, generally high melting pts.,
Coordination number: # of atoms of opposite charge that surround an ion in the crystal structure
Ionic cpds. will conduct a current

4. Metallic bonds
Free sea of electrons…this is what allows the ductile and malleable nature to occur.
202: body-centered, face-centered, hexagonal close packed xl structures.
Alloys: solutions

5. Molecules and cpds.
Covalent bonds: sharing electrons to satisfy the octet rule. Again, remember, net charge =0.
Diatomic molecule: molecule with 2 atoms.
Diatomic elements: H, N, O, F, Cl, Br, I.
Molecular cpds: lower MP & BP.

6. Molecular Formulas
How many atoms of each element in a molecule of a given compound

7. Bonds
Single bond: the sharing of 2 (aka 1 pair) of electrons between 2 atoms.
Double bond: the sharing of 4 (aka 2 pairs) of electrons between 2 atoms.
Triple bond: the sharing of 6 (aka 3 pairs) of electrons between 2 atoms.
No, no quadruple bonds…sorry. 

8. More on bonds Sigma and pi bond discussion: 230-231
VSEPR: valence shell electron pair repulsion theory: orbitals hybridize as needed for capacity for electrons