Ch 6: Atoms & Atomic Structure

About This Chapter

This overview of atoms and atomic structure covers key topics such as atomic number and ionic bonds. These helpful video lessons are a great resource to use when preparing for a class discussion or a test.

Atoms & Atomic Structure - Chapter Summary

The lessons in this chapter provide an overview of atoms and atomic structure. You'll find an informative discussion of early atomic theories, the Bohr model, and many other topics. After completing the chapter, you should be prepared to:

  • Define atom, atomic number, and mass number
  • Discuss isotopes and average atomic mass
  • Explore electron configurations in atomic energy levels
  • Provide examples of ionic bonds
  • Demonstrate use of atoms and ions to determine molecular formulas
  • Examine early atomic theories of Dalton, Thomson, Rutherford, and Millikan
  • Explain the atomic theory of James Chadwick
  • Describe the Bohr model

These video lessons are brief and engaging, which helps you to easily understand the information presented. Our expert instructors are effective and use plenty of examples. The video timelines allow you to navigate the learning process by going directly to the topics of your choice. Each lesson is accompanied by a brief multiple-choice quiz to test your knowledge. Full video transcripts are also available.

9 Lessons in Chapter 6: Atoms & Atomic Structure
Test your knowledge with a 30-question chapter practice test
The Atom

1. The Atom

The physical basis that everything is composed of is called matter and the smallest unit of matter is called an atom. Learn about the atom, subatomic particles, the nucleus, elements, and the periodic table.

Atomic Number and Mass Number

2. Atomic Number and Mass Number

An atom is defined as the smallest particle of an element that displays the same properties of that element. Learn about the main components of an atom (protons, neutrons, & electrons), the characteristics of each component, and how to determine the atomic number and the mass number of an atom.

Isotopes and Average Atomic Mass

3. Isotopes and Average Atomic Mass

Isotopes are variations of the same element with differing numbers of neutrons and, subsequently, different atomic masses. Learn how scientists consider isotopes when they calculate average atomic mass.

Electron Configurations in Atomic Energy Levels

4. Electron Configurations in Atomic Energy Levels

Electron configuration is the representation of how the electrons in an atom are arranged, which can be used to predict the properties of an element. Learn about patterns of energy levels in elements on the periodic table, how to identify the number of electrons in a neutral atom, and how to write an electron configuration for neutral atoms.

Ionic Bonds: Definitions and Examples

5. Ionic Bonds: Definitions and Examples

Ions are charged atoms that can gain or lose electrons; an ionic bond refers to the formation between a cation and an anion. Explore different examples of ionic bonds, and understand the differences between neutral atoms, anions, and cations.

Using Atoms and Ions to Determine Molecular Formulas

6. Using Atoms and Ions to Determine Molecular Formulas

Molecular formulas are determined using atoms and ions. Learn about different molecular formulas and understand that ions also can determine formulas. Understand coefficients and ionic compounds, and use ionic compounds to explain molecular formulas.

Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

7. Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

The current knowledge of atoms and atomic theory has been informed by many scientists going back to Aristotle and Democritus. Learn about the contributions made to early atomic theory by scientists working in more recent times, such as Dalton, Thomson, Rutherford, and Millikan.

James Chadwick: Biography & Atomic Theory

8. James Chadwick: Biography & Atomic Theory

Learn about English physicist James Chadwick, who discovered the neutron and whose research helped launch the atomic weapons race and the Manhattan Project.

Bohr Model: Definition & Equation

9. Bohr Model: Definition & Equation

Explore the problem of the Saturnian atomic model, how the Bohr equation addresses this problem using the hydrogen atom, and what current theory has taken from the Bohr model to refine and improve on it.

Chapter Practice Exam
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