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📁 玻赫里姆

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It's Elemental: Actinium

http://education.jlab.org/itselemental/ele089.html

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WebElements: Cerium

http://www.webelements.com/cerium/

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Wikipedia: Cerium

http://en.wikipedia.org/wiki/Cerium

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EnvironmentalChemistry.com: Cerium

http://environmentalchemistry.com/yogi/periodic/Ce.html

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