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http://www.cjass.ca/conv49n4.html Ref : The Electronic Absorption Spectra of Lanthanum (III), Cerium (III)and Thorium (IV) Ions in Different Solvents Rafie H. Abu-Eittah*, Sayed A. Marie and Mabrouka B. Salem. Canadian Journal of Analytical Sciences & Spectroscopy Received: May 19, 2004 Accepted (in revised form): August 2, 2004 See the Web Links to the left of this answer for a direct link to the pdf of this article.

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Q: What does the atomic absorption spectra of lanthanum look like?
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What series are called elements 57 to 70?

Elements from atomic number 57 (Lanthanum) to 71 (Lutetium) are called the Lanthanides. Lanthanide means "like Lanthanum" and so, the Lanthanides are based on Lanthanum. Only one of the Lanthanides is radioactive: Promethium (Pm - No. 61)


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