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File:Silicon by woelen.jpg Original by woelen http://woelen.homescience.net/science/chem/elem/elements/Si/index.html(667 × 500 (67 KB)) - 20:15, 18 February 2016File:Potassium peroxochromate K3CrO8 by woelen.jpg Original by woelen: http://woelen.homescience.net/science/chem/exps/K3CrO8_synth/result.jpg(720 × 580 (202 KB)) - 21:43, 29 July 2016