The Electron

Discovering the Electron

A subatomic particle with a negative electric charge resides outside of the nucleus of an atom. These particles, called electrons, are known to have a mass that is just a fraction in size when compared to other subatomic particles. How was this particle discovered? In the interactivity, click on each of the numbered buttons to view information about the discovery of the electron.

View a printable version of the interactivity.

Discovering the Electron Review

The discovery of the electron gave scientists a better idea about the true structure of atoms. Now that you have learned about electrons, review your knowledge in this non-graded activity. Read each question, then select the appropriate answer and click SUBMIT to check your response. Click on the interactivity thumbnail, and then click NEXT to get started.