Everyone is concerned about environmental pollution (well, almost everyone) and how it effects the environment and human health. But did you know that some pollutants, although very toxic and dangerous, are also essential to human health?
Or put another way, did you know that some of those health food supplements you may be taking could make you very sick or even kill you?
Here is a list of 10 toxic metals - well, 9 metals and 1 metalloid, an element that exhibits some properties of metals and some of non-metals - that all show this dual nature. Some of them can cause minor health problems while others can lead to serious illness and even death, depending upon their dosage, exposure time, and how they are combined with other elements.
All images are from the following website and licensed under a Creative Commons Attribution 3.0 Unported License: Hi-Res Images of Chemical Elements, A Virtual Museum
Health effects information, unless otherwise noted, are from: Determination of Toxic Metals and Metalloids in Ambient Air