Khan Academy
Khan Academy: Biology: Chemistry of Life: Atomic Number,atomic Mass,and Isotopes
Learn the fundamental properties of atoms in this article. Understand the definition of atomic number, atomic mass, and isotopes. [6 min, 50 sec]
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...
Encyclopedia of Earth
Encyclopedia of Earth: Uranium
Information about the radioactive element, Uranium, atomic number 92. Describes its history, physical and atomic properties, how abundant it is on the Earth, and permissible exposure limits. Also discusses sources, uses, isotopes,...
Encyclopedia of Earth
Encyclopedia of Earth: Oxygen
Information about the element, Oxygen, atomic number 8. Covers history, physical and atomic properties, abundance, and permissible exposure limits. Also discusses forms of oxygen, isotopes, sources, and uses.
Encyclopedia of Earth
Encyclopedia of Earth: Nitrogen
Information about the element, Nitrogen, atomic number 14. Covers common chemical transformations, its physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations. Also discusses...
Encyclopedia of Earth
Encyclopedia of Earth: Fluorine
Information about the element, Fluorine, atomic number 9. Covers physical and atomic properties, how abundant it is on the Earth, and permissible exposure limits. Also discusses uses, isotopes, and health concerns.
Encyclopedia of Earth
Encyclopedia of Earth: Einsteinium
Information about the man-made element, Einsteinium, atomic number 99. Covers physical and atomic properties, how it was discovered, its history, how it is produced, uses, and a list of its isotopes.
Encyclopedia of Earth
Encyclopedia of Earth: Physics & Chemistry: Calcium
Information about the element, Calcium, atomic number 20. Covers physical and atomic properties, sources, its role in geochemical cycles, how abundant it is on the Earth, its isotopes, some compounds of calcium, and its importance to...
Encyclopedia of Earth
Encyclopedia of Earth: Argon
Information about the element, Argon, atomic number 18. Covers physical and atomic properties, how abundant it is on the Earth, its history, isotopes, uses, and health considerations.
Encyclopedia of Earth
Encyclopedia of Earth: Zinc
Information about the element, Zinc, atomic number 30. Covers physical and chemical properties, how abundant it is on the Earth, where it occurs, isotopes, zinc in the environment, its role in human health, and the history of its use in...