Everythingin the universeis either matter or energy. All matter is made of combinations of about one hundred basic building blocks, the chemical elements on the periodic table. Going a step further and breaking these elements down to...

Explore how changing the numbers of protons, neutrons, and electrons affect the type of atom.

[Free Registration/Login may be required to access all resource tools.] Atoms and how they are related to elements, and the particles that make up atoms.

This unit covers introductory concepts of mixtures and solutions. Students think about how mixtures and solutions, and atoms and molecules can influence new technologies developed by engineers. The first lesson explores the fundamentals...

Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!

Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test how the ideas work!

In this interactive activity from ChemThink, students will take a closer look at atomic structure, properties, and behaviors. Includes background reading material and discussion questions.

[Free Registration/Login Required] Build your own helium atom and make sure it has the correct number of protons, electrons, and neutrons on this site. Site also includes a small quiz on the topic.

Find out if you know enough about atoms to build them. The goal of the activity is to build an atom of a particular element by dragging the correct numbers of neutrons, protons and electrons into the atom.

Explains the basics of atomic structure, from simple definitions to information about quantum theory. Accurate and helpful basics whether or not you need the more advanced information.

Introduces learners to atomic models of the past and present, focusing on the orbital model and an explanation of its basis. Learners then have the opportunity to "make an atom" and contrast it with an ion, followed by an isotope. The...

Visit this site for an interactive tour of the atom and all aspects of particle physics. View the animations available with almost every description on this site. A great place for the fundamentals of particles and forces including a...

A video and a short quiz on the parts of an atom, the periodic table, and molecules.

This activity serves as an introduction to chemistry, and can be used to help learners draw a two dimensional image of the atom.

Kids learn more about the science of the atom. Electrons, neutrons, and protons make up the smallest bits of matter.

This interactive unit will take students up close and personal with the nuclei of atoms as they discover some of their more intimate process. These will include radioactive decay, nuclear fission, and nuclear fusion.

Take a look at the parts of an atom and learn about its properties.

[Free Registration/Login may be required to access all resource tools.] Examine the composition of matter.

[Free Registration/Login may be required to access all resource tools.] Examine the composition of matter.

[Free Registration/Login may be required to access all resource tools.] Discusses the nucleus of an atom and what holds it together.

This lesson will illustrate that an atom is mostly empty space and has a positively charged, massive core (containing both protons and neutrons called the nucleus) surrounded by negatively charged electrons. It is 2 of 3 in the series...

The three basic particles that make up atoms are defined and illustrated.

[Free Registration/Login Required] This flipchart was converted from Power Point and is used to introduce the history and concept of the Atom.

ChemCenter, available from the American Chemical Society, provides chemistry news, reference sources and other public services.