Atoms, Nuclei, Particles, & Other Small Things
The Fundamentals of Particles
A brief outline of the types of particles that exist in the natural world and how they are related to each other.
Enrico Fermi Institute
Enrico Fermi was one of the last great physicists who was adept at both experimentation and theory. The Institute named after him is affiliated with the University of Chicago and is a focal point for studies in experimental and theoretical work in high-energy particle physics and related areas, including astrophysical and geophysical applications of these concepts.
Atomic & Molecular Data Unit
The Atomic & Molecular Data Unit at the International Atomic Energy Agency in Vienna, Austria, maintains a number of databases of information on research in these realms of physics.
Wikipedia: The Atom
This Wikipedia article provides you with basic information on the classical and modern understanding of the atom.
What is Antimatter?
There exists a strange form of matter with the opposite charge of our ordinary matter, which annihilates it when it comes into contact.