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Ch 5: Holt McDougal Modern Chemistry Chapter 5: The Periodic Law

About This Chapter

The Periodic Law chapter of this Holt McDougal Modern Chemistry Companion Course helps students learn the essential lessons associated with the periodic law. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Periodic Law textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Periodic Law chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the periodic law topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • How to read the periodic table
  • What transition metals and main group metals are and how they're different
  • The differences and properties of transition metals vs. main group elements
  • How to identify valence electrons and the energy levels of atoms of elements
  • The difference between atomic and ionic radii
  • How ionization energy works
  • Electronegativity and its relationship within the periodic table

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6 Lessons in Chapter 5: Holt McDougal Modern Chemistry Chapter 5: The Periodic Law
The Periodic Table: Properties of Groups and Periods

1. The Periodic Table: Properties of Groups and Periods

How is the periodic table like the map you used on your last road trip? In this lesson, you will be introduced to the periodic table, the road map of chemists. We will discuss how the elements are organized and how you can use this organization to identify some of their major physical properties.

Transition Metals vs. Main Group Elements: Properties and Differences

2. Transition Metals vs. Main Group Elements: Properties and Differences

Which is better: to be steadfast and consistent or to be a colorful chameleon? This lesson compares and contrasts the main group elements and the transition metals. Then make your own decision!

Valence Electrons and Energy Levels of Atoms of Elements

3. Valence Electrons and Energy Levels of Atoms of Elements

The periodic table contains a wealth of information. This lesson will explain how to use it to quickly determine the most useful information about the most important electrons. We will be focusing our discussion on valence electrons and energy levels.

Atomic and Ionic Radii: Trends Among Groups and Periods of the Periodic Table

4. Atomic and Ionic Radii: Trends Among Groups and Periods of the Periodic Table

Atoms are VERY tiny. How do we measure their size? This lesson will explain how the size of an atom is measured and teach you how to predict the relative size of an atom based on where it is located on the periodic table.

Ionization Energy: Trends Among Groups and Periods of the Periodic Table

5. Ionization Energy: Trends Among Groups and Periods of the Periodic Table

Do you know someone who has undergone radiation as a form of cancer treatment? Have you ever thought about why X-rays have health risks? Watch the video to find out what these types of radiation are really doing to atoms, define ionization energy and identify ionization trends on the periodic table.

Electronegativity: Trends Among Groups and Periods of the Periodic Table

6. Electronegativity: Trends Among Groups and Periods of the Periodic Table

How is fluorine like a child that doesn't share his or her toys? Find out in this video on electronegativity where we will discuss group and periodic trends among the elements.

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