Tantalum

Tantalum was an element on the periodic table with the symbol Ta (TV: Shada) and atomic number 73. It was mined in Mongolia. (PROSE: Elementary, My Dear Sheila)

The element dubnium was also known as eka-tantalum. (PROSE: Iris Wildthyme y Señor Cientocinco contra Los Monstruos del Fiesta)