Khan Academy
Khan Academy: The Periodic Table, Electron Shells, and Orbitals
The Bohr model and atomic orbitals. Using an element's position in the periodic table to predict its properties, electron configuration, and reactivity.
Wikimedia
Wikipedia: Glenn T. Seaborg
An Wikipedia article on Glenn Seaborg discusses his accomplishments in the world of chemistry. It discusses his creation of the element Plutonium and his work with the Manhattan Project. Also provides some information on personal life...