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A silver-white light malleable ductile metallic element that occurs abundantly in nature and is used in metallurgical and chemical processes, in photography, signaling, and pyrotechnics because of the intense white light it produces on burning, and in construction especially in the form of light alloys .
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Department of Chemistry and Biomolecular Sciences, Macquarie University
http://www.chem.mq.edu.au/
School of Chemistry, University of Sydney
https://sydney.edu.au/science/schools/school-of-chemistry.html
Cincinnati Children's Hospital Medical Center: Asthma
http://www.cincinnatichildrens.org/health/a/asthma/