Day+5

REVIEW Threshold 1: What created all the matter and energy in the universe (big bang)? Threshold 2: What created the diversity of structures we see in the universe (star life and death)? Threshold 3 What created the diversity of matter in the universe (elements)? Threshold 4: Where is a place that molecules can grow big (earth)?
 * review homework
 * review stellar ovens
 * what makes elements different: increasing the number of electrons
 * what makes elements alike and different: periodicity
 * packing electrons in a small space
 * [|orbitals]
 * [|valence electrons]
 * [|simple molecules in space] H20, CO2, CH4, H2, NH3, C6H12O6
 * What do you need to keep molecules happy?
 * types of [|molecular bonds] possible on earth