Introduction

Earlier in this course, you learned about the three subatomic particles that make up an atom: protons, neutrons, and electrons.

All atoms of a given element have an equal number of protons and electrons, meaning they are electrically neutral. But what would happen if an atom gained an electron? What if it lost an electron?

In this lesson, you will learn the answer to these questions. You will also learn why atoms gain or lose electrons, as well as how to name them after that change has occurred.

Illustration of atomic structure shows protons and neutrons being orbited by electrons.

Review subatomic particles by completing this activity. Match each particle on the left with its charge on the right.

To match items, click or tap an item in the left column and then click or tap its match in the right column. If you change your mind, make a different choice. Once you have matched all items, click "Check Answers" to see how you did. Click "Reset" to try again.

Great job!

What will you learn in this lesson?

Let's Practice