[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn how scientists study the properties of stable nuclei in order to draw generalizations about what makes a nucleus stable. They look at...

Find out about radioactivity, and how it occurs inside an atom's unstable nucleus.

For a picture of a topographical map, go to this page. There is some information to help you understand what they are.

This animation discusses the food chain in a storybook format. The chain is described as a cycle and both herbivores and carnivores are discussed.

Site presents a straightforward presentation of Rutherford's work concerning the Law of Energy Conservation. Provides an adequate summary of early science on the nucleus, and includes much needed illustrations.

Acting as part of an overview on quantum theory, this section of the site deals with electrons and orbitals. In addition to explain what an orbital is, the site explains the movement of the electron in relation to the nucleus.

Acting as part of an overview on quantum theory, this section of the site deals with questions related to electrons, such as "If the electron cannot be localized, can it be moving?" and "Why does the electron not fall into the nucleus?"

Read about the nucleus and its properties. These pages have a lot of illustrations.

Instructions for making a simulated comet nucleus from simple materials.

Acting as a subtopic of the General Chemistry Virtual Textbook's section on Atoms and the Periodic Table, this site seeks to answer the question, "Why doesn't the electron fall into the nucleus?"

Provides a definition and explanation of fission, the splitting of a heavy nucleus into two roughly equal parts, and fusion, the process where two nuclei combine together to form a larger nucleus.

Learn how you can find the probability of survival but cannot predict the time of disintegration of an atomic nucleus with this simulation. This site is best viewed with Internet Explorer.

This lesson will explain that electrons are negatively charged particles with negligible mass and are found in pairs in orbitals surrounding the nucleus of an atom. It is 3 of 3 in the series titled "Subatomic Particles: The Electron."

This lesson will explain that protons are positively charged particles having a mass of one amu and are found in the nucleus of the atom. It is 2 of 3 in the series titled "Subatomic Particles: The Proton."

This lesson will illustrate that an atom is mostly empty space and has a positively charged, massive core (containing both protons and neutrons called the nucleus) surrounded by negatively charged electrons. It is 2 of 3 in the series...

This lesson will explain that neutrons are particles in the nucleus that have no charge and a mass of one amu. It is 2 of 3 in the series titled "Subatomic Particles: The Neutron."

Describes the structure and functions of the membrane surrounding a cell nucleus.

This animation discusses light and the properties of electricity in a storybook format. The theme of the story is that a family lost their power, so the animations discuss power and electricity and how it travels into homes.

This animation reviews three famous historical earthquakes in a storybook format with pictures and animations, told from the perspective of three girls.

This animation discusses the harbor seal in a storybook format. It follows the life of Phoca the seal as she is born and travels through the ocean.

A series of lessons in which students learn about landforms. Includes interpreting landforms, creating landforms, and information on Angel Island.

A nice site which provides descriptions of each of the bones that make up our skeletal system. Then there is a lab activity for students to complete in which they build a skeletal system and describe the structure/function of each bone...

An introduction to ants, told in an animated storybook format. Includes information about ant behavior, body structures, and more.

Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. See how random decay times relate to the half life. Java required.