Lecture 9: Periodic Table; Ionic and Covalent Bonds

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  1. Periodic Table (continued)
    1. Electronegativity
    2. Atomic and Ionic Radii and Isoelectronic Atoms
  2. Bonding
    1. Ionic Bonds
    2. Covalent Bonding
    3. Polar Covalent Bonds

Lecture Video

In this lecture, we complete the discussion of the periodic table and start to consider the types of bonds that are formed between elements. Chemist Kateryna Kozyrytska tells us about why the concept of electronegativity is important in the design of antibiotics.

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Lecture Notes

This resource may not render correctly in a screen reader.Notes for Lecture 9 (PDF)

Clicker Questions

Lecture 9 Clicker Questions (PDF)

Textbook Reading

Ionic Bonds Sections 2.1–2.3 Sections 2.1–2.3
Covalent Bonds Sections 2.14–2.16 Sections 2.14–2.16
Lewis Structures Section 2.5–2.6 Section 2.5–2.6

Related Behind the Scenes at MIT Videos

Applying the Special Properties of Halogens in Drug Design

Bacteria can develop resistance to antibiotics, creating a need for current and future scientists to develop new types on antibiotics. Kateryna Kozyrytska discusses her research on proteins that catalyze a carbon-chlorine bond-forming reaction, and she describes how taking advantage of chlorine’s electronegativity may lead to new medications to fight bacteria and the other “bugs” that make us sick.

Kateryna Kozyrytska’s Personal Story

Kateryna Kozyrytska, a female biochemist born in Ukraine, describes how as a scientist she doesn’t have to choose between career and home-life like some of her peers back home, that there are examples, even at MIT, of women who have both.

Problems and Solutions

Problems for Lecture 9 (PDF)

Solutions for Lecture 9 (PDF)


Dogs Teaching Chemistry — Chemical Bonds” courtesy of Lauren Girard. Used with permission.

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