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Chromium (chemical symbol Cr) is one of the trace elements, and is required for the normal functioning of several enzymes, and is also important in glucose homeostasis.
Chromium has the atomic number 24 with an atomic weight of 51.9961 g/mol.
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.
History and etymology