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24 Cr Chromium

Transition metal, mass: 51.996 u, 3 stable isotopes (52, 53, 54), abundance rank (earth/space): 21/16

Click image to magnify. Pure chromium piece, about 20 grams. Original size in cm: 2 x 2
Chromium Chromium with spectrum line
Chromium is a very hard and shiny silvery metal and has many colorful compounds. A lot of these are quite toxic. Chromium(VI), e.g. as CrO3, is a very dangerous environmental toxin. Elemental chromium is widely used for plating for optical reasons and corrosion protection. Chromium is added to steel, to make it stainless.

Chromium same piece Chromium dioxide cassette tape
Right: Cassette tape, coated with chromium dioxide (CrO2). Cr4+ is dark brown to black.

Ruby Ruby under black light
Natural ruby, Al2O3 and Cr2O3. Cr3+ actually is green, but in this combination causes a red color (left) and fluoresces under UV light (right). Original size in cm: 0.5 x 0.8.




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The images are licensed under a Creative Commons Attribution 3.0 Unported License, unless otherwise noted. Attribution by linking (outside of the internet credit with url) to the according element page.


Page last changed on March 05. 2016

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