[Free Registration/Login Required] Uncover the relationship between pressure, force, and contact area in the context of a fire truck. Play with vehicle mass, number of tires, and guage pressure with this simulation to see what...

This simulation allows students to understand relative binding energy.

A very detailed look at the element Gallium, a member of the Boron Group.

A very detailed look at the element Indium, a member of the Boron Group.

A very detailed look at the element Thallium, a member of the Boron Group.

[Free Registration/Login may be required to access all resource tools.] Students take a closer look at how our understanding of the atom has evolved over time.

In this online biology textbook, learn about atoms and molecules as they relate to life. Find out about topics such as electrons and energy, chemical bonding, and chemical reactions.

This lesson will define the Modern Period Law. It is 2 of 3 in the series titled "Modern Periodic Law."

As part of the "Basic Atomics" section of the Virtual Textbook, this site examines formulas and how they are read and written. Other topics covered include a concept map, simplest formulas, and masses.

Travel back in history and visit the laboratories of Priestley, Lavoisier, and others. Take part in simulations of the experiments which laid the foundation for the scientific field of chemistry. Learn about the discoveries which lead to...

Engaging and very informative article that explains what elements are, some of their history, how they are represented, the categories of elements, the periodic table, and how they are structured and classified.

Set of tables describing many physical and chemical properties of the element vanadium.

Review atoms with this slideshow. You can choose to listen to the review or read the accompanying text. At the end, play the game to review the basics of atoms that you have just learned about. You may play the game as many times as...

A site containing a good deal of elemental information. Information on each element includes atomic number, atomic mass, melting point, boiling point, density, isotopes and more.

A site containing a good deal of elemental information. Information on each element includes atomic number, atomic mass, melting point, boiling point, density, isotopes and more.

A site containing a good deal of elemental information. Information on each element includes atomic number, atomic mass, melting point, boiling point, density, isotopes and more.

Learn about radioactivity, the different types of radioactive decay, isotopes, and half-life of a radioactive element. Includes a long chart listing radioactive elements, atomic number and mass number, decay type, and length of half-life.

Almost all of the energy that drives the various systems (climate systems, ecosystems, hydrologic systems, etc.) found on the Earth originates from the sun. Solar energy is created at the core of the sun when hydrogen atoms are fused...

Students explore the concept of the mole as a measure of quantity. They build spreadsheets that allow them to convert between moles, grams, and atomic mass units for given quantities of everyday items, elements, and simple chemical...

This site has an interactive component that allows you to change the mass, number of electrons and the length of the box and see how it affects the energy levels. Requires Java.

An interactive map which shows every country that has nuclear weapons, has programs to gain nuclear weapons, had nuclear weapon programs, or is suspected of having a nuclear weapon.

Have you ever wondered what would happen if you converted the mass of a paper clip into an amount of energy? In this informative quiz, discover the answer, and explore other examples of mass-energy equivalence.

Joseph John Thomson, better known as J. J. Thomson, was a British physicist who first theorized and offered experimental evidence that the atom was a divisible entity rather than the basic unit of matter, as was widely believed at the...

Describes the design of the first nuclear reactor by Enrico Fermi and his successful development of a self-ustaining nuclear chain reaction. Describes the evolution of the Manhattan Project and their race to develop the first atomic...