Learn how atoms are the building blocks of all living and nonliving things.

In this activity, students construct models of molecules using marshmallows and gum drops.

Build elements and molecules using neutrons, protons, and electrons. Choices include helium, carbon, oxygen, aluminum, water, and salt.

[Free Registration/Login may be required to access all resource tools.] Discusses elements, atoms, compounds, molecules, and crystals. Looks at mixture and different types of them.

Through hands-on activities, students play the role of nitrogen atoms traveling through the nitrogen cycle to gain understanding of the varied pathways through the cycle and the relevance of nitrogen to living things.

[Free Registration/Login may be required to access all resource tools.] In the following online tutorail students will learn how to express the arrangement of electrons in atoms through electron configurations and Lewis valence electron...

Click to read different historical documents in chemistry related to the history of the study and discovery of radioactivity.

Each electron has a set of quantum numbers that specify it's location, orbital, and energy in a unique manner.

An explanation of the different types of atomic orbitals, how they are filled according to the Pauli Exclusion Principle, and how many electrons can fit in each electron shell.

Produce light by bombarding atoms with electrons. See how the characteristic spectra of different elements are produced, and configure your own element's energy states to produce light of different colors.

1HNMR theory begins in the nucleus of hydrogen. Complete this tutorial on the 1HNMR spectrum graph to learn about the number of equivalent hydrogens, b) the chemical environment of each hydrogen type and c) the number of neighbouring...

How well do you know your elements? The computer will randomly pick the name of one of the elements. Use the clue to discover which element the computer picked. Be careful! Each incorrect letter you guess causes the atom man to decay.

Take an interactive quiz over the atomic structure and number of elements. After completing the quiz, check your score, and then revisit any incorrect question for further review

The atoms around you have existed for billions of years- and most originated in the flaming, gaseous core of a star. Dennis Wildfogel tells the captivating tale of these atoms' long journeys from the Big Bang to the molecules they form...

A podcast tutorial describing the main characteristics of matter. [1:02]

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...

Slideshow looking at the history of models of the atom, including those proposed by John Dalton, J.J. Thomson, Ernest Rutherford, Niels Bohr, and James Chadwick. Discusses subatomic particles, including the numbers of protons, neutrons,...

Explains the basic tenets of Dalton's atomic theory.

Try these five multiple-choice questions that help students review atoms, elements, and compounds. Each question has a hint and a self-checking feature.

Chemical composition is a section of a larger overview on Chemistry, covering a variety of aspects. This section focuses on elements, atoms, compounds, and structure. Examples, formulas, and pictures are provided.

Students will find an explanation of the neutron particle located inside the atom's nucleus. Website also defines isotopes and the process of radioactive decay.

This simulation displays the electron configurations of for the elements in relation to the element's position on the periodic table.

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...

This Webelements website provides a short but detailed definition of atomic radius. Includes links to other chemistry sites.