Protactinium (Pa). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of prot
Protactinium (Pa). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of protactinium-231 (atomic number: 91), the most stable isotope of this element. The nucleus consists of 91 protons (red) and 140 neutrons (orange). 91 electrons (white) successively occupy available electron shells (rings). Protactinium is an actinide in period 7, and the f-block of the periodic table. Actinides are soft radioactive metals. Protactinium-231, rare in nature and usually extracted from spent nuclear fuel, has a half-life of 32,760 years. Its unstable nucleus decays by emitting an alpha particle to form actinium-227.
Size: 5197px × 5008px
Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: -atomic, -block, 5f, 5f2, 6d, 6d1, 7, 7s, 7s2, actinide, actinides, actinoid, actinoids, amu, atom, atomic, background, black, block, chemical, chemistry, configuration, data, diagram, electron, electronic, electrons, element, elemental, elements, energy, function, illustration, isotope, level, levels, neutron, neutrons, nuclear, nucleon, nucleons, nucleus, number, orbital, orbitals, pa, period, physical, pm, properties, property, protactinium, protactinium-231, proton, quantum, radioactive, radioisotope, radioisotopes, radius, shell, shells, simple, solid, solids, structural, structure, subatomic, subshell, subshells, symbol, types, valence, wave, weight
