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Lottie Peppers

http://www.acs.org/content/dam/acsorg/education/resources/highschool/chemmatters/archiv... - 0 views

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    Metals are what make smartphones so "smart." An average smartphone may contain up to 62 different types of metals. One rather obscure group of metals-the rare-earth metals-plays a vital role. The rare-earth metals include scandium and yttrium, as well as elements 57-71. Elements 57-71 are known as the lanthanides, because they begin with the element lanthanum.
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