객관식
Which of the following atoms has the largest number of neutrons?
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2. Atoms & Elements
Isotopes
Multiple Choice
How many neutrons are present in the nucleus of an isotope of phosphorus with a mass number of 32?
A
32
B
47
C
17
D
15
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검증된 단계별 안내1
Identify the atomic number (Z) of phosphorus, which is the number of protons. For phosphorus, Z = 15.
Understand that the mass number (A) is the total number of protons and neutrons in the nucleus. Here, A = 32.
Use 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: \(N = 32 - 15\), which gives the number of neutrons in the isotope.
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