"In nature, chromium exists as three stable isotopes: 52Cr, 53Cr and 54Cr. 52Cr is the commonest on Earth, accounting for 83.8% of the total. In total an additional 19 unstable isotopes are known, ranging from the stablest, 50Cr with a half life of 1.8 × 1017 years, and 51Cr with a half-life of 27.7 days, and the rest with half lives all shorter than a day. Several decaying in seconds only."
"chromium-51 is a radioisotope used as a tracer in nuclear medicine for labelling red cells."
"In 1761, Johann Gottlob Lehmann (1719–1767) 2, a German geologist, discovered the mineral crocoite in the Urals, which is now known to be lead chromate."
"Louis-Nicolas Vauquelin (1763–1829) 2, a French chemist, produced chromium (III) oxide from crocoite in 1797. The following year he extracted impure chromium from reducing chromium (III) oxide with charcoal in 1798."
"Its importance in normal human physiology is contentious, indeed the European Union no longer classifies it as an essential trace element, whilst the USA, Japan and Australia still do. It is the only mineral for which the US and European Union do not concur on its essential status."
"Its importance in normal human physiology is contentious, indeed the European Union no longer classifies it as an essential trace element, whilst the USA, Japan and Australia still do. It is the only mineral for which the US and European Union do not concur on its essential status."
Expected headings
"Basic chemistry"
"Nutrition"
"In nature, chromium exists as three stable isotopes: 52Cr, 53Cr and 54Cr. 52Cr is the commonest on Earth, accounting for 83.8% of the total. In total an additional 19 unstable isotopes are known, ranging from the stablest, 50Cr with a half life of 1.8 × 1017 years, and 51Cr with a half-life of 27.7 days, and the rest with half lives all shorter than a day. Several decaying in seconds only."
"Its importance in normal human physiology is contentious, indeed the European Union no longer classifies it as an essential trace element, whilst the USA, Japan and Australia still do. It is the only mineral for which the US and European Union do not concur on its essential status."