A simple explanation of the structures theoretically found within protons and neutrons. The resource consists of pictures and links to additional resources.

Brief explanations of how to determine how many protons, neutrons, and electrons are in an element.

[Free Registration/Login may be required to access all resource tools.] Students learn about the important discoveries of subatomic particles, and how they led to our current understanding of the atom.

An interactive website where students learn about the basics of an atom, periodic tables organization, and the structure and properties of matter. Module includes an introduction and five lessons that are followed by a quiz and an...

Learners will use bags of beads with known quantities of electrons, neutrons and protons to identify the element that they represent.

Site presents a straightforward presentation of Rutherford's work concerning the Law of Energy Conservation. Provides an adequate summary of early science on the nucleus, and includes much needed illustrations.