Unit 2: Matter, Its Properties and Changes
Properties and Changes in Matter Part 1
Properties and Changes in Matter Part 2
Unit 4: Electrons in Atoms
Quantum Mechanical Model of the Atom
Electron Configurations - Noble Gas — You can ignore the part about electron dot notation
Unit 5: The Periodic Law
History of the Periodic Table (Part 1) — 11/16/15
History of the Periodic Table (part 2) — 11/16/15 - Technical difficulties divided this video into two parts. Make sure to watch both parts of the lesson.