When I am doing matter and materials in science, I like to have the students look at molecules and atoms of basic compounds that they might see every day, such as table salt. We look at the periodic table, and we look at molecular makeup starting with water, as they are all familiar with H2O but perhaps not what it actually looks like. We then choose an interesting molecule and build it. I have found a few sites that allow you to build virtually build the molecules and view them in 3D, plus manipulate them so you can see them from different perspectives. MolView is one of these sites that allows you to experiment with building molecules and manipulate them. It gives you different ways of representing the model in 3D, is linked to a periodic table to check out the elements, and a search bar to find specific compounds or minerals.