Ch 9: General Science: Atomic Structure

About This Chapter

The state of Arizona uses the NES General Science exam in place of the AEPA General Science exam. As you prepare for this test, use this chapter to study for questions about the Bohr model of atomic structures, different atomic structures and electron configurations.

AEPA General Science: Atomic Structure - Chapter Summary

Use the activities of this chapter to improve your understanding of the atomic structures in preparation for related questions on the National Evaluation Series (NES) General Science certification exam. First watch this series of short, engaging lesson videos taught by our expert instructors as they describe the:

  • Bohr model of atomic structures and atomic spectra
  • Structures of the atomic nucleus and the electron shell
  • Atomic number and atomic mass
  • Types of isotopes and average atomic mass
  • Electron configuration and atomic energy levels

After you've completed these lessons take the lesson quizzes to test your understanding of the material presented. Use your quiz results to find the topics you don't fully understand, then use video tags to take you to the locations of quizzes that discuss these topics. To aid in your review, also read over the lesson transcripts that highlight in bold some of the key terms of the lessons.

10 Lessons in Chapter 9: General Science: Atomic Structure
Test your knowledge with a 30-question chapter practice test
The Bohr Model and Atomic Spectra

1. The Bohr Model and Atomic Spectra

Do you ever wonder where light comes from or how it is produced? In this lesson, we are going to use our knowledge of the electron configurations and quantum numbers to see what goes on during the creation of light.

Atomic Nucleus: Definition, Structure & Size

2. Atomic Nucleus: Definition, Structure & Size

The atomic nucleus is the central part of the atom. There is a lot to be told by the structure of the atomic nucleus. This lesson goes through the structure of the atomic nucleus and other factors that the atomic nucleus tells us.

The Electron Shell

3. The Electron Shell

You may be familiar with the role of electrons in electrical devices, but did you know that electrons also determine the chemical reactivity of everything around you?

Protons: Definition, Charge & Mass

4. Protons: Definition, Charge & Mass

Protons can be found in the nucleus of every atom. While originally it had been thought that protons were a fundamental particle, recent research has shown that protons are made of quarks. This lesson will cover the properties of the proton.

Neutrons: Definition & Concept

5. Neutrons: Definition & Concept

Neutrons are the big guys of the atom. This lesson explains the structure of the neutron, its properties, and some of its influences on the function of the atom.

Atomic Number and Mass Number

6. Atomic Number and Mass Number

Atoms are the basic building blocks of everything around you. In order to really understand how atoms combine to form molecules, it's necessary to be familiar with their structure. In this lesson, we'll dissect atoms so we can see just what really goes into those little building blocks of matter.

What is Atomic Mass? - Definition & Examples

7. What is Atomic Mass? - Definition & Examples

Atomic mass is a characteristic of an atom that is a measure of its size. It is plays a major role in the chemical properties of elements. This article discusses atomic mass and how it is calculated.

What Are Isotopes? - Definition, Types & Examples

8. What Are Isotopes? - Definition, Types & Examples

Not all atoms of an element are identical - atoms of the same element can have different numbers of neutrons. These different versions of the same element are called isotopes. In this lesson, we will discuss the examples and types of isotopes.

Isotopes and Average Atomic Mass

9. Isotopes and Average Atomic Mass

When you drink a glass of water, you are actually drinking a combination of heavy water and light water. What's the difference? Is it harmful? This video will explain the difference between the two types of water and go into detail on the significance of the different isotopes of elements.

Electron Configurations in Atomic Energy Levels

10. Electron Configurations in Atomic Energy Levels

This lesson will explain what the electrons are doing inside the atom. Tune in to find out how we specify where they are located and how this location description will help us predict an element's properties.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Other Chapters

Other chapters within the AEPA General Science (NT311): Practice & Study Guide course