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Periodic Table

This resource explores essential concepts in chemistry, including periodic trends such as atomic size, ionization energy, and electronegativity. It provides insight into bond polarity, explaining how differences in electronegativity influence bond characteristics. Through engaging clicker questions, it addresses bonding types, ionic and non-ionic compound formulas, and the Localized Electron Model (LEM) with a focus on Lewis structures. Key concepts are reinforced with practical examples, making it a valuable guide for students studying chemical bonding and molecular properties.

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Periodic Table

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  1. Periodic Table • Electron configurations • Charges (stable ions for compounds) • Trends (size, ionization energy, electronegativity) • Polarity of bonds (greater difference in electronegativity, more polar) • Determine formulas of compounds (Ionic and Non-ionic)

  2. Clicker #1 Rank the following bonds from least polar to most polar: Si-Cl P-Cl Mg-Cl S-Cl A) S-Cl, P-Cl, Mg-Cl, Si-Cl B) P-Cl, S-Cl, Si-Cl, Mg-Cl C) Mg-Cl, Si-Cl, P-Cl, S-Cl D) Mg-Cl, S-Cl, P-Cl, Si-Cl E) S-Cl, P-Cl, Si-Cl, Mg-Cl

  3. Localized Electron Model (LEM) • Increase probability that we know where electrons are • We assume electrons are always where we place them

  4. Localized Electron Model (LEM) • Increase probability that we know where electrons are • We assume electrons are always where we place them FORMULA SHAPES PROPERTIES OF MOLECULES H20

  5. Localized Electron Model (LEM) • Increase probability that we know where electrons are • We assume electrons are always where we place them • Electrons shared in order to lower energy state of molecule (“fill shell”) FORMULA SHAPES PROPERTIES OF MOLECULES H20

  6. Localized Electron Model (LEM) • LEM = LEWIS STRUCTURES!! • Assume ONLY the valence electrons matter • I.e. - N : 1s22s22p3

  7. Localized Electron Model (LEM) • LEM = LEWIS STRUCTURES!! • Assume ONLY the valence electrons matter • I.e. - N : 1s22s22p3 • 5 valence electrons

  8. Clicker #2 How many electrons would hydrogen have to share in a covalent bond in order to have a noble gas electron configuration? A) 0 B) 2 C) 3 D) 6 E) 8

  9. Clicker #3 How many valence electrons are in NO3–? A) 4 B) 18 C) 23 D) 24 E) 32

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