1. READ THE BOOK pg 220-221
2. brief Description http://en.wikipedia.org/wiki/Timeline_of_chemical_elements_discoveries
3.http://www.nytimes.com/2010/04/07/science/07element.html
2. brief Description http://en.wikipedia.org/wiki/Timeline_of_chemical_elements_discoveries
3.http://www.nytimes.com/2010/04/07/science/07element.html

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