Khan Academy
Khan Academy: Isotopes and Mass Spectrometry
Tutorial explains isotopes, atomic weight and how isotopes can be detected using mass spectrometry. Examples are given.
Chem4kids
Chem4 Kids: Isotopes
This overview of isotopes explores where isotopes come from and returning an atom to its normal state.
Web Elements
Web Elements Periodic Table: Periodic Table of the Elements
This site has a periodic table on it. When you click on each element, it brings up information about it. Site is organized, detailed, and helpful for learning.
Chem4kids
Chem4 Kids: Atoms
This site provides a detailed overview of atoms. Content explores an atom's structure, as well as what ions are, how atoms bond, what compounds are (including how to name compounds), and what isotopes are.
OpenStax
Open Stax: Elements and Atoms, the Building Blocks of Matter
This site provides an overview of elements and atoms, the building blocks of matter.
Other
University of Waikato: Science Learning Hub: Absolute Dating
Explains what absolute dating is as compared to relative dating and how they can work together. The characteristics of several different radiometric methods are compared. Includes three short videos and an interactive where students...
Department of Defense
Do Dea: Chemistry Review
Review atoms with this slideshow. You can choose to listen to the review or read the accompanying text. At the end, play the game to review the basics of atoms that you have just learned about. You may play the game as many times as...
Frostburg State University
General Chemistry Online: Atoms & Ions
This site from the General Chemistry Online of the Frostburg State University provides a review of the history of atomic theory, the discovery of the electron, and the discovery of the nucleus. Details on weighing atoms, ion charges,...
Texas Education Agency
Texas Gateway: Ap Physics I: Appendices: Selected Radioactive Isotopes
This is a chart showing Selected Radioactive Isotopes including: Decay Mode(s), Energy(MeV), y-Ray Energy(MeV), and more.
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.
CK-12 Foundation
Ck 12: Isotopes and Atomic Mass
[Free Registration/Login may be required to access all resource tools.] Students explain the workings of a mass spectrometer, and describe how this device is used to determine average atomic mass.
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.
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.
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: Investigating Isotopes and Average Atomic Mass Using Pennies
In this activity, students apply what they have learned about weighted averages, isotopes, and systems of equations to a new situation - coins in a sealed container. They learn some historical information regarding the composition of...
Environmental Chemistry
Periodic Table of Elements: Gallium
A very detailed look at the element Gallium, a member of the Boron Group.
Environmental Chemistry
Periodic Table of Elements: Indium
A very detailed look at the element Indium, a member of the Boron Group.
Environmental Chemistry
Periodic Table of Elements: Thallium
A very detailed look at the element Thallium, a member of the Boron Group.
Wikimedia
Wikipedia: Centrifuge
Wikipedia provides detailed information and history on centrifuges in scientific research and industry, including its importance in making nuclear weapons.
University of Colorado
University of Colorado: Physics 2000: Isotopes
A simplified explanation of isotopes with excellent graphic examples.
Other
Chemistry Resources: The Elements: Alkali Metals
This subtable lists and describes the six alkali metals of the periodic table of Elements. Related links are provided.
CK-12 Foundation
Ck 12: The Nucleus and Isotopes
[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn about the particles in an atomic nucleus, isotopes, and nuclear forces.
Famous Scientists
Famous Scientists: Ernest Lawrence
Learn about the life and work of Ernest Lawrence, inventor of cyclotron and founder of big science.
Chemicool
Chemicool: Iodine
This site from Chemicool by David D. Hsu is a very nice set of data tables summarizing just about all the important physical and chemical properties of iodine. This is a great site to check out on the subject.