1.     Elements and Atoms 2.     Introduction to the atom 3.     Orbitals 4.     More on orbitals and electron configuration 5.     Electron Configurations 6.     Electron Configurations 2 7.     Valence Electrons 8.     Groups of the Periodic Table 9.     Periodic Table Trends: Ionization Energy 10.   Other Periodic Table Trends 11.   Covalent Networks, Metallic, and Ionic Crystals 12.   Mini-Video on Ion Size 13.   Ionic, Covalent, and Metallic Bonds 14.   Van Der Waals Forces 15.   Molecular and Empirical Formulas 16.   The Mole and Avogadro's Number 17.   Formula from Mass Composition 18.   Balancing Chemical Equations 19.   Stoichiometry 20.   Stoichiometry: Limiting Reagent 21.   Stoichiometry Example Problem 1 22.   Stoichiometry Example Problem 2 23.   Limiting Reactant Example Problem 1 24.   Stoichiometry of a Reaction in Solution     1.     http://www.khanacademy.org/video/elements-and-atoms?playlist=Chemistry 2.     http://www.khanacademy.org/video/introduction-to-the-atom?playlist=Chemi... 3.     http://www.khanacademy.org/video/orbitals?playlist=Chemistry 4.     http://www.khanacademy.org/video/more-on-orbitals-and-electron-configura... 5.     http://www.khanacademy.org/video/electron-configurations?playlist=Chemistry 6.     http://www.khanacademy.org/video/electron-configurations-2?playlist=Chem... 7.     http://www.khanacademy.org/video/valence-electrons?playlist=Chemistry 8.     http://www.khanacademy.org/video/groups-of-the-periodic-table?playlist=C... 9.     http://www.khanacademy.org/video/periodic-table-trends--ionization-energ... 10.   http://www.khanacademy.org/video/other-periodic-table-trends?playlist=Ch... 11.   http://www.khanacademy.org/video/covalent-networks--metallic--and-ionic-... 12.   http://www.khanacademy.org/video/mini-video-on-ion-size?playlist=Chemistry 13.   http://www.khanacademy.org/video/ionic--covalent--and-metallic-bonds?pla... 14.   http://www.khanacademy.org/video/van-der-waals-forces?playlist=Chemistry 15.   http://www.khanacademy.org/video/molecular-and-empirical-formulas?playli... 16.   http://www.khanacademy.org/video/the-mole-and-avogadro-s-number?playlist... 17.   http://www.khanacademy.org/video/formula-from-mass-composition?playlist=... 18.   http://www.khanacademy.org/video/balancing-chemical-equations?playlist=C... 19.   http://www.khanacademy.org/video/stoichiometry?playlist=Chemistry 20.   http://www.khanacademy.org/video/stoichiometry--limiting-reagent?playlis... 21.   http://www.khanacademy.org/video/stoichiometry-example-problem-1?playlis... 22.   http://www.khanacademy.org/video/stoichiometry-example-problem-2?playlis... 23.   http://www.khanacademy.org/video/limiting-reactant-example-problem-1?pla... 24.   http://www.khanacademy.org/video/stoichiometry-of-a-reaction-in-solution...