Exposed surfaces form corrosion resistant oxide film. Attacked by HF and fused alkalis. Metal ignites in air. Chiefly occurs in the mineral tantalite. Often used as an economical substitute for platinum.
Tantalum pentoxide is used in capacitors and in camera lenses to increase refracting power.
It and its alloys are corrosion and wear resistant so it is used to make surgical and dental tools. If you have comments, correction or suggestions about this site, please send me an e-mail .