1. Click on any formula to build the Lewis diagram for the molecule.
  2. Drag the provided symbols of the relevant elements into the blue squares.
  3. Drag the provided pairs of electron dots or crosses into the grey rectangles.
  4. Make sure you use the correct number of bonding pairs and lone pairs in the molecule. You do not have to put electrons in every grey rectangle.
  5. Click the CHECK button to see whether your diagram is correct.