Chemistry Middle School

compare and contrast these isotopes: uranium -239, uranium -238, and uranium -235

Answers

Answer 1

Answer: They have same number of protons but differ in number of neutrons.

Explanation:

Isotopes are defined as the species which have same number of neutrons but differ in the number of neutrons.

Uranium is the 92nd element of the periodic table.

Atomic number is defined as the number of protons that are present in an atom.  

Atomic number = Number of protons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

For the given isotopes:  [tex]_{92}^{239}\textrm{U},_{92}^{238}\textrm{U}\text{ and }_{92}^{235}\textrm{U}[/tex]

For [tex]_{92}^{239}\textrm{U}[/tex]

Number of protons = 92

Number of neutrons = 239 - 92 = 147

For [tex]_{92}^{238}\textrm{U}[/tex]

Number of protons = 92

Number of neutrons = 238 - 92 = 146

For [tex]_{92}^{235}\textrm{U}[/tex]

Number of protons = 92

Number of neutrons = 235 - 92 = 143

Hence, they have same number of protons but differ in number of neutrons.

Answer 2
Final answer:

Uranium-239, uranium-238, and uranium-235 are three isotopes of uranium. They have different numbers of neutrons and exhibit different properties. Uranium-238 is the most stable, while uranium-235 and uranium-239 are used as nuclear fuel.

Explanation:

Uranium-239, uranium-238, and uranium-235 are three isotopes of uranium. Isotopes have the same number of protons but different numbers of neutrons. Uranium-239 has 92 protons and 147 neutrons, uranium-238 has 92 protons and 146 neutrons, and uranium-235 has 92 protons and 143 neutrons.

Uranium-239 and uranium-235 are both used as fuel in nuclear reactors and have the ability to undergo nuclear fission, releasing a large amount of energy. Uranium-238 is not fissile but can undergo a process called alpha decay, where it emits an alpha particle.

In terms of stability, uranium-238 is the most stable isotope among the three, followed by uranium-235 and uranium-239. Uranium-238 has a very long half-life, which makes it useful for dating rocks and determining the age of the Earth.

Learn more about Isotopes of uranium here:

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