Images and Properties of the Lanthanoids
The lanthanoids form an own series within the periodic table. For them, simplified, with increasing numbers not the outer shell is filled up with electrons, like it is for the conventional elements and not the next inner shell, like it is for transition metals, but a further inside lying shell, the so-called 4f orbital, is filled up. Because chemical properties mainly are determined by the outer electrons, which for the lanthanoids are identical, they are all chemically similar. Lanthanoids are silvery, relatively soft, ignoble and more or less toxic metals. They are hard to isolate and difficult to be separated from each other. Therefore, if sufficient, often mischmetal is used, which is a mixture of them. Lanthanoids often play important roles in special technical applications. They don't have a biological relevance.
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Page last changed on March 05. 2016
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