Virginia Tech
Virginia Polytechnic Institute: Greenhouse Dinosaur Extinction Theory
This comprehensive page discusses the Asteroid Impact vs. Volcano-Greenhouse dinosaur extinction debate. It was written by paleontologist, professor, and scientist Dr. Dewey McLean.
Nobel Media AB
The Nobel Prize: The Nobel Prize in Physics 1935 Presentation Speech
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.
Utah Education Network
Uen: Build an Atom
Students use cereal, marshmallows, and frosting to help them understand the concept of the atom, ion, and isotope, as well as the locations of subatomic particles in the atom, the concept of strong nuclear force.
City University of New York
John Jay College of Criminal Justice: Atomic Structure
Resource shows the relationships bewteen terms such as atomic number, protons, and isotopes. Simple pictures of atoms help.
University of Colorado
University of Colorado: Physics 2000: Halflife
An interactive tutorial on half life. Very readable and has a little extra for the advanced student.
Science Education Resource Center at Carleton College
Serc: Investigating Isotopes: Using M&m's as a Model for Calculating Atomic Mass
This activity allows students to gain an understanding of the relationship between the mass and relative abundance of an isotope and its effect on the average atomic mass of the element. Students will be given a random sample of the...
Science Education Resource Center at Carleton College
Serc: Radioactive Dating: Looking at Half Lives Using M&ms
In this activity, young scholars gain a better understanding of radioactive dating and half-lives by using M&Ms to demonstrate the idea of radioactive decay. They will be able to see how scientists can determine the age of rocks by...
Estrella Mountain Community College
Online Biology Book: Chemistry I: Atoms and Molecules
In this online biology textbook, learn about atoms and molecules as they relate to life. Find out about topics such as electrons and energy, chemical bonding, and chemical reactions.
University of Colorado
University of Colorado: Physics 2000: Isotopes
A simplified explanation of isotopes with excellent graphic examples.
Other
Chemical Elements: Iodine
This site from Chemical Elements.com has great information on iodine. It lists the basic information and then provides the atomic structure in the form of a graph picture. A list of isotopes is also provided.
Georgia Department of Education
Ga Virtual Learning: Historical Geology
In this interactive tutorial you will explore how geologists use clues in rocks to determine the order in which rocks formed. Learn how principles of radioactivity are used to assign actual ages to rocks. Students will explore fossils...
CK-12 Foundation
Ck 12: Chemistry: Isotopes
[Free Registration/Login may be required to access all resource tools.] Defines isotope and describes calculations involving isotopes.
CK-12 Foundation
Ck 12: Physical Science: Neutrons
[Free Registration/Login may be required to access all resource tools.] Neutrons and how they cause different isotopes of an element, and the particles in neutrons.
Chem4kids
Chem4 Kids: Atoms: Neutrons
Students will find an explanation of the neutron particle located inside the atom's nucleus. Website also defines isotopes and the process of radioactive decay.
Annenberg Foundation
Annenberg Learner: Isotopes, a Weighty Matter: Isotope Quiz
You will be presented with three different isotopes of the same element. See if you can calculate the atom's average relative mass.
Other
Lcid: Comparison of Fission and Fusion Processes
From the Science Teacher's Resource Center. A data sheet tabulating the many differences between nuclear fission and nuclear fusion. Technical information about the nuclear reactions, the mass defect, isotope masses, etc. is included.
Physics Aviary
Physics Aviary: Practice Problems: Binding Energy of a Nucleus
Determine the binding energy per nucleon for a random isotope.
Physics Aviary
Physics Aviary: Practice Problems: Half Life From Graph
Determine the half-life of an isotope based on the graph of the amount of the isotope left as a function of time.
Physics Aviary
Physics Aviary: Practice Problems: Half Life From Data
Determine the half-life of an isotope based on the activity data of the isotope as a function of time.
Physics Aviary
Physics Aviary: Practice Problems: Decay Constant and Half Life From Table
Determine the decay constant and half-life of an isotope based on the activity data of the isotope as a function of time.
Science Struck
Science Struck: List of Radioactive Elements
Learn about radioactivity, the different types of radioactive decay, isotopes, and half-life of a radioactive element. Includes a long chart listing radioactive elements, atomic number and mass number, decay type, and length of half-life.
BBC
Bbc: Gcse Bitesize: Atomic Structure
This lesson focuses on the structure of atoms. All substances are made from atoms. Each atom is made of a nucleus - containing protons and neutrons - surrounded by electrons. It provides a link to an assessment.
Frostburg State University
General Chemistry Online: Atoms, Elements, and Ions Faq
Get the skinny on all things frequently asked about isotopes, subatomic particles and atomic theory. Find out what a "dalton" is or the difference between Na+ and Na.
CK-12 Foundation
Ck 12: Chemistry Simulation: Average Atomic Mass
[Free Registration/Login Required] Students explore how percent abundances of different isotopes affect the average atomic mass for that given element. Students form connections between the average atomic mass and a person's body mass....