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 …

El protactinio es un elemento químico de la tabla periódica cuyo símbolo es Pa y su número atómico es 91.. El elemento fue identificado por primera vez en 1913 por Lise Meitner y …

¿Qué es el Protactinio? El Protactinio símbolo Pa, conocido en la pa tabla periodica como un elemento químico metálico, pertenece al grupo de los actínidos. Es de color plateado con un …

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 …

Protactinium is one of the rarest and most expensive naturally occurring elements. The average concentrations of protactinium in the Earth's crust is typically on the order of a few parts per …

El protactinio es un metal muy raro, brillante, plateado y altamente radiactivo que se deslustra lentamente en el aire hasta convertirse en óxido. Casi todo el protactinio natural es el isótopo …

Sep 17, 2013 · One of the rarest naturally occurring elements, protactinium occurs in Earth’s crust in average concentrations of a few parts per trillion. This rarity makes it one of the most …

Protactinium is the 91st element in the periodic table and has a symbol of Pa and atomic number of 91. It has an atomic weight of (231.03588) and a mass number of 231. Protactinium has …

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 …

Element #91 was predicted by Д.И. Менделеев (D.I. Mendeleyev) in 1871 and named by him Eka-Tantalum (note) . The first isotope of Protactinium to be discovered was 234 Pa m (also …