Protactinium is the next-to-last heaviest element, just preceding uranium (atomic number 92) in the periodic table. Protactinium's atomic number is 91, its atomic mass is 231.03588, and i...
Protactinium is an actinide series element denoted by the atomic symbol, Pa. It has an atomic number of 91 and the average atomic weight of its isotopes is 231.03588. It is a metallic sol...
Protactinium is one of the rarest elements on Earth. It is formed when uranium ...