Go to: https://phet.colorado.edu/en/simulation/legacy/build-a-molecule

1. Click the picture of the simulation.  It will download a file.  
2. Open up the file that was downloaded.
3. Agree to whatever it asks…
4. Select the “Make Molecules” tab
5. Build the molecules using the “kits” on the bottom of the page.
1. It makes a difference how you put the molecules together.  Sometimes they take a little tinkering.
2. If you need more of an atom, you can click the "refill kit” button.
6. After you build all of the molecules in Collection 1, you will open up collection 2.
7. Finish 5 collections then get me to sign off on your progress