Answer :
Statement regarding uranium-238 and plutonium-239 false is An atom of plutonium-239 contains one more proton than an atom of uranium-238.
With a relative abundance of 99%, uranium-238 (238U or U-238) is the most prevalent isotope of uranium to be discovered in nature. It is non-fissile, unlike uranium-235, hence it cannot support a chain reaction in a thermal-neutron reactor. It can, however, be converted into fissile plutonium-239 since it is fertile and rapid neutron fissionable. Because inelastic scattering lowers neutron energy below the range where rapid fission of one or more next-generation nuclei is likely, 238U cannot maintain a chain reaction. Another crucial negative feedback mechanism for reactor management is Doppler widening of the neutron absorption resonances of 238U, which increases absorption as fuel temperature rises.
Complete question:
In a certain type of nuclear reactor, uranium-238 can be converted to plutonium-239, another radioactive element (with an atomic number of 94) that can be used to power nuclear reactions. Which of the following statements regarding uranium-238 and plutonium-239 is false?
A) An atom of uranium-238 has a smaller mass than an atom of plutonium-239.
B) An atom of plutonium-239 contains one more proton than an atom of uranium-238.
C) An atom of plutonium-239 contains two more protons and one fewer neutron than an atom of uranium-238.
D) An atom of plutonium-239 contains 145 neutrons.
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