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Answer :
To find out how many protons, neutrons, and electrons are in uranium-235 with an atomic number of 92, follow these steps:
1. Determine the Number of Protons:
- The atomic number of an element indicates the number of protons in the nucleus of an atom.
- Since uranium has an atomic number of 92, it has 92 protons.
2. Determine the Number of Electrons:
- In a neutral atom, the number of electrons equals the number of protons.
- Therefore, uranium-235 also has 92 electrons.
3. Calculate the Number of Neutrons:
- The mass number of an atom is the sum of its protons and neutrons.
- For uranium-235, the mass number is 235 (as indicated by the "-235").
- To find the number of neutrons, subtract the atomic number (number of protons) from the mass number:
[tex]\[
\text{Neutrons} = \text{Mass number} - \text{Atomic number} = 235 - 92 = 143
\][/tex]
So, uranium-235 has 92 protons, 92 electrons, and 143 neutrons. This corresponds to the first option: "92 protons, 92 electrons, 143 neutrons".
1. Determine the Number of Protons:
- The atomic number of an element indicates the number of protons in the nucleus of an atom.
- Since uranium has an atomic number of 92, it has 92 protons.
2. Determine the Number of Electrons:
- In a neutral atom, the number of electrons equals the number of protons.
- Therefore, uranium-235 also has 92 electrons.
3. Calculate the Number of Neutrons:
- The mass number of an atom is the sum of its protons and neutrons.
- For uranium-235, the mass number is 235 (as indicated by the "-235").
- To find the number of neutrons, subtract the atomic number (number of protons) from the mass number:
[tex]\[
\text{Neutrons} = \text{Mass number} - \text{Atomic number} = 235 - 92 = 143
\][/tex]
So, uranium-235 has 92 protons, 92 electrons, and 143 neutrons. This corresponds to the first option: "92 protons, 92 electrons, 143 neutrons".
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