Our understanding of the atom has changed over the past few hundred years! Read about a few different theories on the structure of an atom.

The periodic table of the elements is an important classification system of the most basic particles that make up our world!

This list of elements is missing mega-information: a combination of category, name, number, or symbol. Can you fix them up?

Important information has gone missing from the periodic table. Can you fix up these elements so that they read the right way?

Discover the difference between physical properties and chemical properties of matter in this informative science worksheet!

Get a brief history of the atom with this introductory page for young physicists!

Learn the language of chemistry by reading and writing chemical equations in this middle-grade worksheet! 

Zoom in on atoms in this informative worksheet!

Explore elements and compounds in the context of particle models and chemical formulas!