0:00 Section 2.4 Atomic Weights: Calculate the average atomic mass of an element from the isotopic masses and isotopic abundances.
18:24 Section 2.5 The Periodic Table: Identify metals, metalloids, and non-metals on the periodic table. Understand the terms period and group; identify which period and group a particular element is in. Know the family names for Groups 1A, 2A, 6A, 7A, and 8A.
25:50 Section 2.6 Molecules and Molecular Compounds: Identify the meaning of molecular compounds (versus ionic compounds). Distinguish between empirical formulas and molecular formulas; write the empirical formula if given the molecular formula. Brief discussion in video on structural formulas.
36:07 Section 2.7 Ions and Ionic Compounds: Know the terms cation and anion. Memorize the monatomic ions that always have the same charge.
45:35 Write formulas for ionic compounds if given the ions with correct charges.
These are the lectures that I use in my General Chemistry I course. The textbook I use is Brown, Theodore et al "Chemistry: The Central Science", Pearson, 14th Ed., 2018, ISBN13: 978-0134414232. Some images used in this video come from that textbook.

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