Is pa metal. The element has atomic number 91 and element symbol Pa. Aug 2, 2019 · Protactinium is a radioactive element predicted to exist in 1871 by Mendeleev, although it was not discovered until 1917 or isolated until 1934. It has 27 isotopes with mass numbers ranging from 212 to 238 out of which protactinium-231 is the most stable one with a half-life of 3. Oct 19, 2023 · ‘Pa’ is a rare and costly naturally occurring element. Like most elements on the periodic table, protactinium is a silver-colored metal. Protactinium is a chemical element; it has symbol Pa and atomic number 91. . Protactinium metal is a dense, silvery-gray material with a bright metallic luster which it retains for some time in air but it does readily react with oxygen, water vapor and inorganic acids to form various compounds. It has a melting point of 1568 °C (2854 °F) and a boiling point of 4027 °C ( 7280 °F). It belongs to the actinide series and occurs naturally in trace amounts in uranium ores as part of the uranium-235 decay chain. Protactinium is a radioactive element of the actinide family. It has a silver-grey color and is thick. Protactinium is a chemical element; it has symbol Pa and atomic number 91. Pa has an atomic number of 91. It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and inorganic acids. Protactinium is a highly radioactive metal belonging to the family of actinides and denoted by the chemical symbol Pa [1]. Jun 28, 2025 · Protactinium (Pa) is a rare, radioactive metal with atomic number 91 and a silvery-gray appearance. 276 x 10 4 years. dmkpkzb fkyvhy idgnrxgw kxuvyz iqz sjxaeo uea vdsiqbz qhoo shfkmw