The half-life of uranium 238 is of 4.5 billion years, while uranium 235 has a … Answer and Explanation: Uranium 235 definition, the radioactive uranium isotope having a mass number of 235, comprising 0.715 percent of natural uranium. Tags: When bombarded with neutrons it undergoes fission with the release of energy. neutrons = 143 . answer choices . SURVEY . 92. 60 seconds . Name: Uranium Symbol: U Atomic Number: 92 Atomic Mass: 238.0289 amu Melting Point: 1132.0 °C (1405.15 K, 2069.6 °F) Boiling Point: 3818.0 °C (4091.15 K, 6904.4 °F) Number of Protons/Electrons: 92 Number of Neutrons: 146 Classification: Rare Earth Crystal Structure: Orthorhombic Density @ 293 K: 18.95 g/cm 3 Color: silverish Atomic Structure cenzzzzzzzzie cenzzzzzzzzie 05/14/2020 Physics High School +5 pts. See answer the choices are 92, 93, 143, or 235 harmonympaull harmonympaull This isotope has half-life of 7.04×10 8 years (6.5 times shorter than the isotope 238) and therefore its abundance is lower than 238 U (99.28%). A uranium nucleus has 92 protons. Radioactive isotope technetium-99m has a half-life of 6 hours. It is assigned the chemical symbol U. How many neutrons does it have? How many neutrons does the isotope uranium-235 have - Answer . There are some good answers here, but I'll address uranium specifically. protons, atomic number, and mass number. atomic number and electrons. All isotopes of uranium are unstable and radioactive, but uranium 238 and uranium 235 have half-lives which are sufficiently long to have allowed them to still be present in the Solar System and indeed on Earth. As all uranium nuclei have 92 protons, the nucleus of a uranium-235 atom will also have 143 neutrons to give it a total atomic mass number of 235. How many neutrons does it have? The atomic number, #Z#, of any element, is the number of protons, positively charged nuclear particles, contained in the nucleus.The mass number (#235#) is the sum of the number of protons, AND the number of neutrons, NEUTRALLY charged nuclear particles.Note that only protons and neutrons contribute to atomic mass to any degree.. You have #""^235U#.If #Z=92# how many neutrons … 143. neutrons & mass number. Uranium 235. Uranium-235 is an isotope of Uranium-238, all this means is that Uranium-235 has the same number of protons and electrons as Uranium-238, but a different number of neutrons. Tags: Question 5 . A) fissionable material B) excess production of neutrons C) nuclear chain reaction D) source of neutrinos to trigger explosion 57. It was discovered in 1935 by Arthur Jeffrey Dempster. electrons = 92. A) 92 B) 143 C) 235 D) 327 56. atomic number and neutrons. 238. 146. Uranium-235 (235 U) is an isotope of uranium making up about 0.72% of natural uranium.Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction.It is the only fissile isotope that exists in nature as a primordial nuclide.. Uranium-235 has a half-life of 703.8 million years. Answered Uranium-235 has 92 protons. 55. answer choices . Uranium-238 isotope is most common isotope of uranium found on Earth (about 99.28% of the entire Earth’s uranium is basically U-238). Uranium is a silvery-white metallic chemical element in the periodic table, with atomic number 92. Even though uranium is abundantly available on Earth, the uranium-235 isotope has low abundancy (only about 0.72% of the entire Earth’s uranium is U-235). Uranium 235, which alone constitutes 0.72% of natural uranium is the second common isotope of uranium in the nature. How many neutrons does uranium-235 have? 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