Kids learn more about the science of the atom. Electrons, neutrons, and protons make up the smallest bits of matter.

ChemCenter, available from the American Chemical Society, provides chemistry news, reference sources and other public services.

Resource shows the relationships bewteen terms such as atomic number, protons, and isotopes. Simple pictures of atoms help.

Learn the fundamentals of particles and forces with this site. Explore the paths that explain matter in the universe.