This module develops atomic-level causal models to explain observations of electrostatic interactions via the following activities: Activity 1. What is the effect of changing the composition of an atom? Activity 2. How do objects become...

With this activity learners will observe and record the properties of various types of bar soap. They will discover that due to the ingredients some soaps are denser than others, and ivory soap will actually float. Students will see a...

This is a simple picture of a hydrogen atom using the Bohr model. A negatively charged electron can be seen on the outside of the positively charged proton.

An article that discusses the coupling of an electric field with a magnetic field to create electromagnetic waves. Article also discusses how different types of electromagnetic waves have different wavelengths which forms the...

Article explains the experiments on the photoelectric effect and how these experiments led to the idea of light behaving as a particle of energy called a photon.

In this module Activity 2 investigates What holds the atoms of a molecule together?The activity will explore what holds atoms together and why they from a molecule. Bonus reading includes Same Molecules but Different Representations.

[Free Registration/Login may be required to access all resource tools.] Reintroduction of the idea of the atom and the billiard ball model.

During this exercise, practice finding the number of valence electrons in an element. [1:22]

This lesson focuses on the periodic table and the configurations. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic configurations model how electrons are arranged in atoms. A link to...

In this module Activity 2 investigates What happens to atoms during a chemical reaction? In this activity students explore chemical reactions and develop a model to explain observations of chemical reactions.

The Committee on Elementary-Particle Physics, part of the U.S. National Research Council, presents this massive report on particle physics. It's a definitive document. Surprisingly readable, totally detailed. Start with the Table of...

Learn about the life of Aage Niels Bohr, and see how his work was pivotal in the development of the theory of the structure of the atomic nucleus.

Acting as a subtopic of the General Chemistry Virtual Textbook's section on Atoms and the Periodic Table, this site specifically discusses emission and absorption spectra in relation to the Bohr model.

View the interactions between an atom of xenon and a buckyball when they collide.

Fact-Index.com offers a brief dictionary definition of the Balmer series, including hyperlinked terms.

Fact-Index.com offers a dictionary definition of the Paschen series, including hyperlinked terms.

This lesson explains what is represented by the atomic mass, and how it varies from one element to the next. Module includes a slideshow and a quiz.

An animation of a quantum corral made by iron atoms on a copper surface.

An animation of a scanning tunneling microscope, STM, image of a quantum stadium corral made of iron atoms on a copper surace.

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....

A good overview of diamonds. Gives information on structure, properties, and origin. Includes models that can be rotated and examined in 3D. Also has activity for building your own carbon atom.

An illustration of a mercury atom.

[Free Registration/Login Required] Given prior knowledge of bonding and the molecular make up of aspartame, examine the model and determine which color represents which atom. Drag the labels at the bottom to the appropriate colored atom...