Learn about Thomson's cathode ray experiment and the plum pudding model and Rutherford's gold foil experiment.

This lesson focuses on the structure of atoms. All substances are made from atoms. Each atom is made of a nucleus - containing protons and neutrons - surrounded by electrons. It provides a link to an assessment.

This website provides a short but detailed definition of atomic radii. Also shows the atomic radius plotted against atomic number.

This site from the encyclopedia Wikipedia provides a basic definition for what the atomic radius is, and an explanation of what covalent and metallic radii are.

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

[Free Registration/Login may be required to access all resource tools.] Rutherford's discovery of the nucleus and his planetary model of the atom.

[Free Registration/Login may be required to access all resource tools.] This site explains Rutherford's discovery of the nucleus and the planetary model of the atom and the role of gold foil experiment in refining the atomic model. It...

Through informational text, interactive activities, and virtual animations students learn about the atomic nucleus, fission, fusion, and radioactive decay.

From the Atomic Archive - the online companion to the award-winning CD-ROM. This page defines nuclear fusion and depicts the process by an informative diagram. Includes numerical values which describe the typical energy values for fusion...

This multi-day lesson plan helps students to understand how the models of the atom have changed and how quantum mechanics affects the electrons as they orbit the nucleus.

Wikipedia provides the definition of the term, "Atomic number," a term used in chemistry and physics to represent the number of protons in the nucleus of an atom.

Determine the binding energy per nucleon for a random isotope.

Learn how you can find the probability of survival but cannot predict the time of disintegration of an atomic nucleus with this simulation. This site is best viewed with Internet Explorer.

Learn about the life of Aage Niels Bohr, and see how his work was pivotal in the development of the theory of the structure of the atomic nucleus.

Take a look at the parts of an atom and learn about its properties.

For this activity, learners will review and investigate the stability of the nucleus of various elements and determine factors that affect that stability. Students will get an understanding of why certain nuclei are unstable and what...

[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn how scientists study the properties of stable nuclei in order to draw generalizations about what makes a nucleus stable. They look at...

[Free Registration/Login Required] Study the basics of radioactive decay and the properties of atomic nuclei in Marie Curie's laboratory and classroom. A PDF worksheet and a video tutorial are also available. [3:32]

This lesson explains Rutherford's gold foil experiment and the discovery of the nucleus. It is 2 of 3 in the series titled "Ernest Rutherford."

Acting as part of an overview on quantum theory, this section of the site deals with electrons and orbitals. In addition to explain what an orbital is, the site explains the movement of the electron in relation to the nucleus.

This site from the General Chemistry Online of the Frostburg State University provides a review of the history of atomic theory, the discovery of the electron, and the discovery of the nucleus. Details on weighing atoms, ion charges,...

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.

Read about the nucleus and its properties. These pages have a lot of illustrations.

Interactive concept simulation demonstrates the nuclear fusion of deuterium and tritium inside a tokamak reactor.