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

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...

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

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...

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