Learn the fundamentals of particles and forces with this site. Explore the paths that explain matter in the universe.

Describe the $ifference between the subatomic particles, including their masses, locations, and charges. This lesson is 2 of 7 in the series titled "Subatomic Particles."

This diagram shows a basic atom structure with an atom core, proton, neutron and electron.

This personal page describes the history and technical facts of the atom, including the nucleus, nucleons, the Bohrs atom, the electron, and more.

This personal page describes the history and technical facts of the atom, including the nucleus, nucleons, the Bohrs atom, the electron, and more.

Test yourself on the names and formulas of some common anions. This interactive animation makes it fun to learn about atoms that have gained electrons.

Article explores the key points of Dalton's atomic theory and the laws of conservation of mass and constant composition. Which points do we still use today?

Water is both essential and unique. Many of its particular qualities stem from the fact that it consists of two hydrogen atoms and one oxygen, therefore creating an unequal sharing of electrons. From fish in frozen lakes to ice floating...

Explore molecule shapes by building molecules in 3D. How does molecule shape change with different numbers of bonds and electron pairs? Find out by adding single, double or triple bonds and lone pairs to the central atom. Then, compare...

Acting as a subtopic of the General Chemistry Virtual Textbook's section on Atoms and the Periodic Table, this site discusses the properties of the atoms individually in relation to the main group elements of the Periodic Table.

Study chemical bonding in chemistry including atoms, valence electrons, ionic and covalent bonding, and how molecules are formed on this site!

Simulate the original experiment that proved that electrons can behave as waves. Watch electrons diffract off a crystal of atoms, interfering with themselves to create peaks and troughs of probability. Java required.

An advanced explanation of the valence shell electron pair repulsion (VSEPR) theory describes specific molecular models involving digonal, trigonal, tetrahedral, and octahedral coordination, as well as central atoms with five bonds....

Learn how to read the periodic table of elements as you solve these Math questions about the number of protons, neutrons, electrons or nucleons in an atom of an element. You can choose how many questions to answer, and how complex they...

[Free Registration/Login may be required to access all resource tools.] A collection of learning opportunities about electron orbitals. Includes videos, activities, discussion questions, and quizzes.

An interactive website where students learn about the basics of an atom, periodic tables organization, and the structure and properties of matter. Module includes an introduction and five lessons that are followed by a quiz and an...

Build a molecule in 3-D. Add single, double, and triple bonds, or a lone pair of electrons to an atom, learn what the molecule's geometric name is, see the bond angles, and manipulate each molecule to view it from all sides. Then study a...

[Free Registration/Login may be required to access all resource tools.] In the following online tutorial, students will begin to describe the electron-sea model of metallic bonding. They will explain how metallic bonding is responsible...

A fun way to learn about the periodic table! This interactive table allows students to investigate the basic information of an element as well as explore group and family characteristics.

This resource presents a biography of Bohr, including many personal tidbits, as well as a substantial treatment of his scientific work. Several interesting quotes by and about Bohr are included. It also links to several other sources.

The Nobel Physics Chairman made this speech when presenting the Prize to Chadwick. It clearly explains the importance and depth of Chadwick's work. Site by Nobel e-Museum.

Young scholars explore the periodic table and learn the basic information given for elements: the name, symbol, atomic number, and atomic mass for each element.

Antimatter, the charge reversed equivalent of matter, has captured the imaginations of science fiction fans for years as a perfectly efficient form of energy. While normal matter consists of atoms with negatively charged electrons...

When do photons, electrons, and atoms behave like particles and when do they behave like waves? In this interactive, use quantum detectors to explore how measurements change the waves and the patterns they produce on the screen.