Multiple Choice
A potassium atom has a mass number of 37. What is the number of neutrons in this atom?
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2. Atoms & Elements
Isotopes
Multiple Choice
How many neutrons are present in an atom of uranium-235?
A
92
B
235
C
146
D
143
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Verified step by step guidance1
Identify the atomic number (Z) of uranium, which is the number of protons. For uranium, Z = 92.
Identify the mass number (A) of the isotope, which is the total number of protons and neutrons. For uranium-235, A = 235.
Recall the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to solve for neutrons: \(N = A - Z\).
Substitute the known values: \(N = 235 - 92\), which gives the number of neutrons in uranium-235.
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