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Group 6 element
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==Biological occurrences== Group 6 is notable in that it contains some of the only elements in periods 5 and 6 with a known role in the biological chemistry of living organisms: molybdenum is common in [[enzymes]] of many organisms including humans, and [[tungsten]] has been identified in an analogous role in enzymes from some [[archaea]], such as ''[[Pyrococcus furiosus]]''. In contrast, and unusually for a first-row d-block transition metal, chromium appears to have few biological roles, although it is thought to form part of the [[glucose]] metabolism enzyme in some mammals.
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