Molecular geometry: different number of electron groups with different number of lone pairs (table 10. 1, pg 408 :13 possibilities) Predicting the shapes around central atoms: 1 lewis structures; 2. Molecular geometry of multiple center atoms: define the plane, 2. If more than 2 then first add a and b, find the resultant, then add or subtract the resultant from c. Oxygen is paramagnetic because of its unpaired electrons. The same type of atom can form different types of hybridization. Usually hydrogen can only form 1 bond. Use wave function to mathematically find out how to get the hybridizations of the orbitals. 87- after hybridization you get four sp3 hybrid orbitals. 88-what is different between the c and n- energy, angle, 89- oxygen can form 2 single bonds this is shown in the hybridization because oxygen has 2 lone electrons. Pi bond is when orbitals are parallel to each other.