Is pa metal. The element has atomic number 91 and element symbol Pa. It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and inorganic acids. Protactinium is a chemical element; it has symbol Pa and atomic number 91. It has a melting point of 1568 °C (2854 °F) and a boiling point of 4027 °C ( 7280 °F). 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. Protactinium is a chemical element; it has symbol Pa and atomic number 91. Pa has an atomic number of 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. Protactinium is a radioactive element of the actinide family. It has a silver-grey color and is thick. Protactinium is a highly radioactive metal belonging to the family of actinides and denoted by the chemical symbol Pa [1]. 276 x 10 4 years. Jun 28, 2025 · Protactinium (Pa) is a rare, radioactive metal with atomic number 91 and a silvery-gray appearance. Like most elements on the periodic table, protactinium is a silver-colored metal. Oct 19, 2023 · ‘Pa’ is a rare and costly naturally occurring element. It belongs to the actinide series and occurs naturally in trace amounts in uranium ores as part of the uranium-235 decay chain. . 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. sfno ohpzv swrrxrrp tfvgl tyu ucume hfkm epxwh edqtfegb rkvo