Atom Builder. Here's a chance for you to construct a carbon atom. You'll start with a hydrogen atom, which contains one proton and one electron. Just add protons, neutrons, and electrons. By the way, you must also build each proton and neutron from two types of quarks -- up quarks and down quarks. Finally, some advice: try to keep the particles' charges balanced. Requires Shockwave.
Science Interactive Templates for Middle School Chemistry - covers metals, nonmetals, and metalloids, periodic table, protons, neutrons, electrons, balancing equations, atoms, physical and chemical changes, and more.