Putty is proof that learning can be fun! Share the wonderful world of polymers with your class through an experiment. Young scientists create their own silly putty, then examine its properties.

[Free Registration/Login may be required to access all resource tools.] Definition of atomic mass unit is discussed.

[Free Registration/Login may be required to access all resource tools.] Covers definition of atomic mass and calculations of atomic mass.

[Free Registration/Login Required] Students explore how percent abundances of different isotopes affect the average atomic mass for that given element. Students form connections between the average atomic mass and a person's body mass....

An introduction to the mole, a unit of measurement that quantifies atoms and molecules.

[Free Registration/Login may be required to access all resource tools.] Students read about and explore video clips, diagrams, and example problems using the Ideal Gas Law.

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...

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...

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...