Login

Ch 2: Atom

About This Chapter

Watch informative chemistry video lessons and take quick self-assessment quizzes for immediate feedback. Learn about atomic theory, atom counting, the atomic spectra and more.

Atom - Chapter Summary and Learning Objectives

Most people have heard of an atom. It is a basic scientific concept that we are taught at an early age. Using the engaging lessons in this chapter, you'll delve deeper into the theories that shape our understanding of the atom. Our instructors explain atomic structure as well as the difference between atomic and mass numbers.

You'll also take a look at electron configurations, isotopes and quantum numbers. The video lessons come with a transcript, multiple-choice quiz and the option to submit questions to instructors. Through completing this chapter's lessons, you'll learn more about:

  • Models of the atom
  • Atomic energy levels
  • Patterns of electrons
  • Features of protons
  • Hydrogen's three main isotopes
  • Different forms of electromagnetic radiation

Video Objective
Atomic Number and Mass Number Discover how to find the mass number and atomic number of an atom.
Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan Explore the theories of those who made early discoveries about the atom.
Isotopes and Average Atomic Mass Define isotope and learn about its relationship to atomic mass.
Avogadro's Number: Using the Mole to Count Atoms Examine the ways in which Avogadro's number is used in chemistry.
Electron Configurations in Atomic Energy Levels Learn about the location and activities of electrons.
Four Quantum Numbers: Principal, Angular Momentum, Magnetic & Spin Discover how to write quantum numbers.
The Bohr Model and Atomic Spectra Read about Bohr's research on atomic structure.

7 Lessons in Chapter 2: Atom
Atomic Number and Mass Number

1. 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.

Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

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

Imagine firing a bullet at a piece of tissue paper and having it bounce back at you! You would probably be just as surprised as Rutherford when he discovered the nucleus. In this lesson, we are going to travel back in time and discuss some of the major discoveries in the history of the atom.

Isotopes and Average Atomic Mass

3. 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.

Avogadro's Number: Using the Mole to Count Atoms

4. Avogadro's Number: Using the Mole to Count Atoms

How do we move from the atomic world to the regular world? Because atoms are so tiny, how can we count and measure them? And what do chemists celebrate at 6:02 AM on October 23rd each year? In this lesson, you will be learning how Avogadro's number and the mole can answer these questions.

Electron Configurations in Atomic Energy Levels

5. 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.

Four Quantum Numbers: Principal, Angular Momentum, Magnetic & Spin

6. Four Quantum Numbers: Principal, Angular Momentum, Magnetic & Spin

Each atom inside of an electron has its own 'address' that consists of four quantum numbers that communicate a great deal of information about that electron. In this lesson we will be defining each quantum number and explaining how to write a set of quantum numbers for a specific electron.

The Bohr Model and Atomic Spectra

7. 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.

Earning College Credit

Did you know… We have over 79 college courses that prepare you to earn credit by exam that is accepted by over 2,000 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? Study.com 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.

Support