2/16 - Review bonding/#p,#e,#n (Test 1)

Today we reviewed everything that will be on test one. Then you worked on the review sheet for test 1. A few points:

1. Atomic Number = # of protons
2. #protons - #electrons = charge
3. Mass Number = #protons + #neutrons
It I DON'T give you Mass Number, then you can assume that #protons = #neutrons
**An atom is an isotope if #protons does NOT equal #neutrons
4. Valence electrons = # electrons in the outermost ENERGY LEVEL (NOT orbittals!!)