CHEMICAL ELEMENTS. Read and learn:
http://wordsteps.com/vocabulary/words/548/Chemical+elements+%28%D0%A5%D0%B8%D0%BC%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B5+%D1%8D%D0%BB%D0%B5%D0%BC%D0%B5%D0%BD%D1%82%D1%8B%29
Learn more about periodic table
http://www.lenntech.com/periodic/periodic-chart.htm
http://wordsteps.com/vocabulary/words/548/Chemical+elements+%28%D0%A5%D0%B8%D0%BC%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B5+%D1%8D%D0%BB%D0%B5%D0%BC%D0%B5%D0%BD%D1%82%D1%8B%29
Learn more about periodic table
http://www.lenntech.com/periodic/periodic-chart.htm
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