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Answer :
Explanation:
We have to determine the number of protons, electrons and neutrons that are in the isotope uranium-235. Uranium-235 is an isotope of uranium. An isotope has the same atomic number and position in the periodic table but differs in the mass number.
The mass number of our isotope is 235. We can look for the atomic number in the periodic table. If we look for it we will see that the atomic number of uranium is 92.
mass number = 235
atomic number = 92
By definition the mass number is equal to the number of protons plus the number of neutrons and the atomic number is equal to the number of protons. When the charge of the atom is 0 the atomic number is also equal to the number of electrons.
mass number = n° of protons + n° of neutrons
atomic number = n° of protons = n° of electrons
So we can use these equation to get the amount of the subatomic particles that the we have.
atomic number = 92 = n° of protons = n° of electrons
n° of protons = 92
n° of electrons = 92
mass number = n* of protons + n° of neutrons
n° of neutrons = mass number - n° of protons
n° of neutrons = 235 - 92
n° of neutrons = 143
Answer: 92 protons, 92 electrons, 143 neutrons
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