iodine

Iodine is a chemical element with symbol I and atomic number 53. The name is from Greek ἰοειδής ioeidēs, meaning violet or purple, due to the color of elemental iodine vapor.[2]

For more information about iodine check the Wikipedia article here

ZME Science posts about iodine

Awesome chemistry experiment: the Briggs-Rauscher iodine oscillator

Tue, Feb 28, 2012

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I recently stumbled upon this absolutely dazzling chemistry experiment, and I just had to share it. What you will see is a pretty rare reaction in chemistry – an oscillation reaction. Three clear solutions are combined, and the color gradually changes to amber. Suddenly, the whole thing goes dark blue! Then it stays blue, reverts [...]

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