Tantalum is a chemical element with atomic number 73 and the symbol Ta. Tantalum is a rare, hard, blue-grey, lustrous transition metal and is highly corrosion resistant, existing naturally in the mineral tantalite, always together with the chemically similar niobium. Tantalum is part of the refractory metals group, which are commonly used as minor component in alloys. The chemical inertness of tantalum makes it a valuable substance for laboratory equipment and a substitute for platinum.
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