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The periodicity of chemical elemental species pioneered by Mendeleev at the end of the 19th century is a familiar template to present these elements as a function of their properties. In the present module, the properties that are discussed relate to the toxic impact some of these elements and associated molecules. Human civilization with its exponential increase in industrial activities of recent times has seriously redistributed many toxic metals from the earth's crust to the environment and increased the possibility of human exposure. In some case the knowledge of the toxic aspect of chemical compounds goes far back in history. In other cases the story is much more modern and sometimes goes back only one decade or two. It should also be said that one element showing up in the present page does not mean that this element is entirely bad. It just indicates that the particular element indicated could be catastrophic to the environment or to the health of some human or other life forms. Any basic course in chemistry would have shown you that one single element often exists in many oxidation states or can be preferentially associated with many other molecules, ions, and ligands. We anticipate this new section of the Corrosion Doctors Web site will grow as we gather more information and related cases. You want to share your knowledge and sources of information with our avid visitors please send a note to our We will be more than happy to include your contribution where it fits. See also: Development of the Periodic Table, Dobereiner, Environmental toxicology, Mendeleev, Moseley, Newlands, References, Seaborg While there are hundreds of radionuclides, many of them are rarely encountered. People are much more likely to encounter a few that are used routinely for medical, military, or commercial purposes. The list below shows twelve most commonly encountered radionuclides. (reference)
* tritium is a specific isotope, H-3. Anywhere and anytime you can also search the Corrosion Doctors Web site with Google that has catalogued most pages and words the site contains.
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