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An overview of the periodic table of the elements
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http://www.helium.com/items/1342634-periodic-table-of-elemen...
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rhaylagar
39 months, 3 weeks, 4 days, 10 hours agoGoing back to my school days in college, who could forget the periodic table of elements which we were obliged to memorize just to pass eight units of Chemistry. There is no chemistry textbook, classroom or laboratory that does not have a copy of the periodic table. During our days, we have 109 known elements but nowadays, there are 118. Am I right or I already lost count? READ details at http://www.helium.com/items/1342634
#1 - By rhaylagar, 39 months, 1 week, 11 days, 10 hours ago.
A brief history of how the periodic table was formed and when it actually started. Read the details at http://www.helium.com/items/1342634
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