An interactive periodic table. When you hover over an element, its name, atomic number, group, period, and electron affinity value appear.

Report on Iran's commitment to a nuclear arms control treaty insisting that they be allowed to pursue a nuclear program for peaceful purposes. The US and allies believe Iran is developing atomic weapons. Of particular interest is the...

The beginning of an informative tutorial on antimatter, covering quarks, hadrons, baryons, mesons, leptons, and neutrinos.

This Wikipedia site contains a good deal of information on element 62, Samarium. Includes a definition of the element, characteristics, applications, history, biological role, occurence, and much more. There is also a chart and links...

This site contains informaiton on the law of combining volumes. A formula is given and links to key terms.

Biography of Albert Einstein from an exhibit at Princeton University.

[Free Registration/Login may be required to access all resource tools.] Looks at atoms and how they are related to elements, and the particles that make up atoms.

Innovations in transportation, communication, and weapons transformed the world in the 20th century. The modern era is the most complex yet, and the most fragile. This photo gallery highlights some of these innovations.

A concise description of ionization energy, and a line graph that plots the ionization energies of the first 88 elements vs. the atomic numbers.

This site from Wikipedia provides a wonderful in-depth explanation of ferromagnetism, covering the atomic behavior which is responsible for ferromagnetic properties. Also introduces the concepts of magnetic domains and the Curie...

This lesson will define an isotope and demonstrate how to determine the average atomic mass of an element. It is 4 of 9 in the series titled "Isotopes."

This is part of a small radio show at the University of Houston. It talks about how John Dalton came up with his version of chemical notation, and how it differs from our version of it today. It is available in audio form also.

Identify the basic structure of atoms, the building blocks for all matter.

The American soldiers returning from World War I had a huge impact on the economy. Read about President Truman's domestic policies and find out about the surprise of the election of 1948.

This lesson will define an ion and explain what happens if the number of electrons in an atom changes. It is 1 of 3 in the series titled "Ions."

This site provides information about the element Mendelevium (Md), includes its atomic structure, isotopes, and other facts.

Theodore William Richards (1868-1928) was considered the foremost experimental chemist of his time. He won the Nobel prize for his role in determine the atomic weights of many elements. This house was built in 1900 with design input from...

Have you ever wondered who discovered the electron? The answer is Nobel Prize winning physicist Sir Joseph John Thomson.

A complete overview of Hund's rules including exceptions.

An excellent overview of Hund's Rules. Discusses all three rules thoroughly with provided diagrams.