Protactinium is a chemical element; it has symbol Pa and atomic number 91. It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and …

2019年8月2日 · Protactinium is a radioactive element predicted to exist in 1871 by Mendeleev, although it was not discovered until 1917 or isolated until 1934. The element has atomic …

Protactinium is one of the rarest naturally occurring elements. Two isotopes of protactinium Pa-231 and Pa-234 occur naturally. Pa-231 is the most abundant naturally occurring isotope. …

Protactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91. It occurs in all uranium ores to the extent of 0.34 part per …

Protactinium is a chemical element of the periodic table with chemical symbol Pa and atomic number 91 with an atomic weight of 231.036 u and is classed as actinide. Protactinium is solid …

Element Protactinium (Pa), Group 20, Atomic Number 91, f-block, Mass 231.036. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Protactinium is a chemical element with symbol Pa and atomic number 91. Classified as a n actinide, Protactinium is a solid at room temperature. [Rn]7s 2 5f 2 6d 1. J.C. Slater, J Chem …

The Chemistry Division's Periodic Table describes the history, properties, resources, uses, isotopes, forms, costs, and other information for each element.

Protactinium is a highly radioactive metal belonging to the family of actinides and denoted by the chemical symbol Pa [1]. It has 27 isotopes with mass numbers ranging from 212 to 238 out of …

Protactinium, symbol Pa, has a Centered Tetragonal structure and Silver color. Protactinium is a Actinide element. It is part of group null (). Discover everything about Protactinium Facts, …