IYPT 2019 Elements 024: Chromium: Rubies, chrome-plating, and yellow buses

Element 24 in our International Year of the Periodic Table elements series is chromium. It’s the element that gives rubies their colour and is also responsible for the characteristic yellow colour of school buses. The colour of many gemstones is due to the presence of impurities. In the case of rubies, which are composed of aluminium […]


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