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Niobium (Nb)

Niobium is used in stainless steel alloys for nuclear reactors, jets, missiles, cutting tools, pipelines, super magnets and welding rods.  Niobium, when inhaled, is retained mainly in the lungs, and secondarily in bones. It interferes with calcium as an activator of enzyme systems. There are no data on niobium toxicity from food, as the concentrations are extremely low.

Sources :http://www.lenntech.com/periodic-chart.htm