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...

From the Science Teacher's Resource Center. A data sheet tabulating the many differences between nuclear fission and nuclear fusion. Technical information about the nuclear reactions, the mass defect, isotope masses, etc. is included.

As part of the "Basic Atomics" section of the Virtual Textbook, this site a variety of topics related to simplest formulas including simplest formulas from atom ratios, simplest formulas from mass composition, and more.

Because atoms are neither created nor destroyed in a chemical reaction, the total mass of products in a reaction must be the same as the total mass of the reactants.

The Pop movement spanned the globe at a time when countries were reeling not only from the mass production of cultural and consumer objects, but also from the fallout from WWII, conflicts like the Vietnam War, and the rise of Communism....

Site provides the ABC's of nuclear science including radioactivity and gamma decay to fission and comic rays.

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

This lesson will define the Modern Period Law. It is 1 of 3 in the series titled "Modern Periodic Law."

An atom is made of three parts - protons, neutrons, and electrons. Here you can explore these different parts.

This essay, written for Teachers' Domain, describes the foresight and pattern recognition that Russian chemist Dmitri Mendeleyev used to develop the modern periodic table of elements.

[Free Registration/Login may be required to access all resource tools.] Students explore the history of the periodic table, and explain how the periodic table was originally organized, compared to the arrangement of the modern periodic...

This overview of isotopes explores where isotopes come from and returning an atom to its normal state.

This interactive periodic table developed for Teachers' Domain provides detailed information about the chemical properties of elements and illustrates the electron configurations that determine those characteristics.

[Free Registration/Login Required] Learn what makes each element unique by building the mystery atoms in the periodic table.

As part of the "Basic Atomics" section of the Virtual Textbook, this site examines moles. The information presented defines moles in relation to Avogadro's number and then goes on to describe molar mass and molar volume.

You will be presented with three different isotopes of the same element. See if you can calculate the atom's average relative mass.

This online textbook chapter provides learners with advanced-level reading and practice material on stoichiometry

This lesson will define an isotope and demonstrate how to determine the average atomic mass of an element. It is 2 of 9 in the series titled "Isotopes."

This lesson will define an isotope and demonstrate how to determine the average atomic mass of an element. It is 8 of 9 in the series titled "Isotopes."

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."

Describes the chemical properties of copper, some of its physical properties, and some applications. Includes a table of its chemical properties and the values associated with them, e.g., density, atomic mass, etc.

Identifies how many warheads different countries have throughout the world. Also provides information about the United States' and Russia's current arsenals. Discusses which countries have signed the non-proliferation treaties and which...