Hosted by the National Institute of Standards and Technology (NIST), this article by W. Martin and W. Wiese introduces the basics of atomic structure and spectra. With regard to structure, there is an emphasis on...

This page, from the University of North Carolina - Chapel Hill Chemistry Fundamentals program and the Shodor Education Foundation, discusses five different types of radioactive decay: alpha, beta negative, gamma,...

The US Department of Energy, National Science Foundation (NSF), and Lawrence Berkeley National Laboratory (LBNL) cosponsor the Particle Data Group. This group makes available the Particle Adventure Website, an...