If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Understand: nuclear fusion

You might need: Periodic table

Problem

The sun is powered by nuclear fusion. This process takes place over three main reactions. The equations are shown out of order below.
Drag the equations to place them in the correct order from top to bottom.
1