Its existence was predicted by Russian chemist Dmitry Mendeleyev in his 1871 Protactinium-231 is known to have the longest half-life amongst the isotopes of protactinium. It is a decay product of uranium and has a half-life of 32,760 years. Complete ground state electronic configuration for the Protactinium atom, Unabbreviated electronic configuration. 29 radio isotopes of protactinium have been characterized, with the most stable being 231 Pa with a half-life of 32,760 years. Protactinium is a very rare shiny, silvery, highly radioactive metal that tarnishes slowly in air to the oxide. Protactinium was first identified by Kasimir Fajans and O.H. The number of electrons in each of Protactinium's shells is 2, 8, 18, 32, 20, 9, 2 and its electron configuration is [Rn] 5f 2 6d 1 7s 2. Electron Configuration Isotopes Protactinium has no stable isotopes . 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 number 91 and element symbol Pa. Like most elements on the periodic table, protactinium is a silver-colored metal. Protactinium isotopes form actinium and uranium isotopes as decay products [4]. Githy.com. Protactinium Properties. Each element has a unique atomic structure that is influenced by its electronic configuration, which is the distribution of electrons across different orbitals of an atom. It is a Block F, Group 3, Period 7 element. Atomic Structure of Protactinium Almost all naturally occurring protactinium is the 231 isotope. Includes Concise Form of Electron Configuration Notation and Protactinium (Pa). Home Money Science & Tech U.S. World Environment Page-of-the-day Trivia Protactinium (Pa), Electron Configuration: [Rn] 5f 2 6d 1 7s 2 [Rn] 5f 2 6d 1 7s 2::: example of: Concise Form of Electron Configuration Notation. Multiple-site search is loading. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. Electron configuration; Electron configuration: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 4f 14 5s 2 5p 6 5d 10 5f 2 6s 2 6p 6 6d 1 7s 2: Electrons per shell: 2, 8, 18, 32, 20, 9, 2: History; Discovered: 1913: Discovered by: Oswald Helmuth Göhring Kazimierz Fajans: Named by: Otto Hahn Electron Configuration Number of Neutrons Melting Point Boiling Point Date of Discovery Crystal Structure. Electron Configuration Chart for All Elements in the Periodic Table. Protactinium is a radioactive actinide group metal with the atomic symbol Pa, atomic number 91, and atomic weight 231. However, the metal is dangerous to handle because it and its compounds are both toxic and radioactive. 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f2 6d1 7s2. In the periodic table, the elements are listed in order of increasing atomic number Z. Electron configuration of Protactinium is [Rn] 5f2 6d1 7s2. Protactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91. The particular isotope they found, protactinium-234 m, has a half-life of about 1.17 minutes.They named the element brevium, meaning brief, and then continued with their studies. It occurs in all uranium ores to the extent of 0.34 part per million of uranium. Göhring in 1913 while studying uranium's decay chain. There are 118 elements in the periodic table. It decays by alpha-emission. 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