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
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Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many neutrons are present in an atom of uranium-235?
A
92
B
235
C
146
D
143
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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