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American Chemical Society
Middle School Chemistry: Protons, Neutrons, and Electrons
Investigate why a charged object is attracted or repelled by another charged object. Explore the concept that the attraction between positive protons and negative electrons holds an atom together.
American Chemical Society
Middle School Chemistry: Protons, Neutrons, and Electrons
Explore the particles that make up atoms: protons, electrons, and electrons.
Other
Nuclear Twin: The Discovery of the Proton and Neutron
Trace the history of the discovery of protons and neutrons in this informative site.
BBC
Bbc: Gcse Bitesize: What Does the Periodic Table Tell Us About the Elements?
The number of protons in the atom of an element determines its place in the Periodic Table. The number of electrons in an atom is the same as the number of protons. These electrons are arranged in shells or 'energy levels' around the...
California State University
Csudh Project for Chemistry: Protons, Electrons, and Neutrons
This page is an exercise in relating the number of protons, electrons, and neutrons for an atom or monoatomic ion.
Science4Fun
Science4 Fun: What Is Atom
Fun and interesting illustrated information on atoms including composition, elements, and history.