• PICK UP TODAY’S NOTES ON RAFFAY’S DESK Reactivity of Na vs. Mg • Why did I add phenolphthalein? • What are the reactions of Na & Mg in water? • How do you explain their reactivity? Formal Lab Reports • Purpose should be in full sentences • Data is NOT the same as observations • You need to record data (quantitative) as well Why did I add phenolphthalein? as describe what you see (qualitative) • Sample calculation for each type of calculation you do Formal Lab Reports • Discussion must be in full sentences and you were asked to INCLUDE the answers to the discussion • Conclusion should be short and sweet. Just tell me the results you got! Rf values & unknown mixture Unit 3 Review Models of the Atom • • • • • Dalton: hypotheses and laws Thomson: plum pudding model Rutherford: nuclear model Bohr: planetary model, Bohr diagrams Heisenberg & Schrodinger: electron cloud model Subatomic Structure • Proton, electron, neutrons • Charge, mass, location? • How does changing each of the above change an element or atom? • Ions, isotopes, % abundance • Mass number vs. atomic mass • Calculating atomic mass Periodic Table • How was it developed? How is it organized? • Periods vs. families/groups • Trends: subatomic particles, properties, reactivity, valence electrons, ionization energy, atomic radius, electronegativity • Octet rule • Metals, nonmetals, semiconductors • Homonuclear diatomic molecules Lewis Structures & Bonding • Ionic vs. covalent bonds • Lewis structures of atoms, ions, ionic & covalent compounds • Dipole moments & polarity • >1 possible structure? Look at formal charge • How is bonding affected by valence electrons? • P 188 #86 e, f, k, l, m, p, q, r, s, v, x, y