Step 3: Think about electron repulsions and how regions of electron density arrange themselves around a central atom. Then... Step 4: Predict the geometry of carbon dioxide: What is the electron geometry of water? Click here to see the steps for determining geometry. There are many fascinating uses for nanotechnology. Use one of the links below to search for an interesting example on the Web, or to find your own. When you find one that is compelling to you, paste the URL of the page below, and explain how nanotechnology is put to work in your example. Nanotechnology and Medicine Nanotechnology and Food Nanotechnology and Engineering What other areas can you think of?