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The chemical and physical properties of uranium remain unchanged. But because uranium is a radioactive element the quantity of uranium on the earth is permanently changed due to radioactive decay.

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Why is a sample of uranium compound found to be losing mass gradually?

The loss of mass in a sample of uranium compound could be due to radioactive decay, where uranium isotopes (e.g., uranium-238) are converting into other elements and emitting particles in the process. This decay leads to the creation of daughter products and a decrease in the overall mass of the sample over time.


What does 238 represent in uranium?

238 represents the most common isotope of uranium, uranium-238. It is a naturally occurring isotope found in uranium ores and makes up over 99% of natural uranium. It is not fissile, but can be converted into fissile plutonium-239 in nuclear reactors.


What is the halflife of Uranium-239?

The half-life of uranium-239 is 23.45 minutes.


What are the similarities and differences between the isotopes uranium 235 and uranium 238?

Similarities: Both uranium-235 and uranium-238 are isotopes of uranium, meaning they have the same number of protons but different numbers of neutrons. They are both radioactive and can undergo nuclear fission. Differences: Uranium-235 is the primary isotope used for nuclear fuel and weapons due to its higher susceptibility to fission compared to uranium-238. Uranium-238 is more abundant in nature, constituting over 99% of natural uranium, while uranium-235 is less common.


What are the similarities and differences between the isotopes uranium-235 and uranium-238?

Uranium-235 and uranium-238 are the isotopes of the same element - uranium, a natural radioactive chemical element; the atomic number is the same - 92. Also the electronic structure, the number of protons, etc. Differences: atomic mass, number of neutrons, U-235 is fissile with thermal neutrons but U-238 is only fertile, halflife, type of disintegration types and energy of emitted radiations, etc.