American Elements - a one-stop resource for anyone looking for all of the pertinent information on any single element in the periodic table, and much more.
Periodic Table Live! - allows you to explore a broad range of information about the elements, their reactions, their properties, their structures, and their histories. It is part of the Chemical Education Digital Library (http://www.chemeddl.org/) provided by the American Chemical Society.
Models 360 - enables users to investigate a collection of 3-D interactive models of organic and inorganic compounds, including extended-structure solids. Users can manipulate the models to examine structure and bonding and demonstrate molecular geometries, vibrations, symmetry, and orbitals. It is part of the Chemical Education Digital Library (http://www.chemeddl.org/) provided by the American Chemical Society.
So you found a website that seems great for your project, but you're wondering if it's okay to use. Here's a handy guide to help you decide. Evaluating Web Sources 
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