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 …

Protactinium is dense silver grey metal. It is highly radioactive. It belongs to actinide series and is placed between thorium and uranium in the periodic table. The melting point of protactinium is …

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 (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 …

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 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 …

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 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 …

Oct 14, 2021 · Protactinium atom is an actinoid atom and a f-block element atom. Protactinium has been reported in Paris polyphylla var. chinensis with data available. A radioactive element …

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 …