Acting as a subtopic of the General Chemistry Virtual Textbook's section on Atoms and the Periodic Table, this site discusses a series of topics related to electrons including atoms that have only one electron, effects of electron-electron repulsion, the Aufbau rules, and more.

Covering a range of topics related to the quantum theory of the atom, this site provides a three-part dissection of atomic theory including information on particles, waves, light, electrons, and atoms.

As part of the Virtual Textbook, this site examines all things related to Atomic Theory including information on atoms, molecules, formulas, equations, nomenclature, and more.

Covering a range of eight topics related to chemistry, this resource provides a wealth of information complete with pictures, charts, graphs, and examples. Includes information on elements, compounds, atoms, molecules, structures, formulas, and more.

Here you can find all kinds of helpful information about chemistry. Learn about reactions, elements, atoms, matter, or biochemistry. Downloads and activities are also included.

This site provides a detailed overview of atoms. Content explores an atom's structure, as well as what ions are, how atoms bond, what compounds are (including how to name compounds), and what isotopes are.

In this interactive activity, students view six models to investigate what a gas, liquid, and solid look like at the atomic level. Choose to view a gas or liquid made of atoms only, a gas made of diatomic molecules, a liquid made of triatomic molecules, or two types of solids. In each simulation, users may highlight an atom and view its trajectory to see how the motion differs in each of the three primary phases. Don't miss the extension activity: a side-by-side comparison of the atomic structure of a hot liquid and a cold liquid. If you click "Withdraw the Barrier", the two liquids mix. Which state of matter has stronger attractions between atoms? This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology.

This interactive activity from ChemThink takes a closer look at a covalent bond--how it is formed and how the sharing of two electrons can keep atoms together.

So we know that all matter is made up of atoms, but what is an atom made out of? Chemists describe the structure of atoms using models. This section will cover the Bohr model, photoelectric effect, absorption and emission spectra, quantum numbers, and electron configurations.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

A video lecture that discusses how elements relate to atoms. Also discussed are protons, electrons, and neutrons. [13:08]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Video tutorial explores how elements relate to atoms and provides the basics of how protons, electrons, and neutrons make up an atom. [13:08]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

This site from the General Chemistry Online of the Frostburg State University provides a review of the history of atomic theory, the discovery of the electron, and the discovery of the nucleus. Details on weighing atoms, ion charges, isotopes, and counting particles.

Chemical Reactions in Action — explores student misconceptions about atoms, molecules, and chemical reactions and provides practical advice for pedagogical approaches. Explore the research: http://s.si.edu/1IwH5zS

Matter is all around us, so it's a good idea to know what it is, and why it matters. Learn about matter, its categories, and its subcategories with this interactive lesson.

When two or more atoms combine they give rise to a molecule. A molecule can be made up of many atoms of the same element. There are 112 elements known to man, so can you imagine the different permutations and combinations of molecules that can exist freely in nature or be synthesized in a laboratory? [1:58]

Learn to identify different molecular shapes, to understand the interactions that create these shapes, and how to predict a molecule's shape given certain information about it. Explore these concepts using three-dimensional computer models and answer a series of questions to reinforce your understanding.

A materials science and engineering professor, Dr. Chris Muhlstein of Penn State University, explains how to rearrange atoms without touching them with your hands. [3:06]

At this website from The Nobel e-Museum, read about Harold Clayton Urey (1893-1981 CE), the chemist awarded with a Nobel Prize "for his discovery of heavy hydrogen." Download Urey's Nobel Lecture, "Some thermodynamic properties of hydrogen an deuterium," (in PDF format) and read a brief biography, which provides information on both Urey's personal life and professional career.

Examples of identifying hybridization and geometry for atoms in organic molecules. [10:20]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.