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Which of the following pairs represent isotopes?
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2. Atoms & Elements
Isotopes
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How many neutrons are present in the isotope nitrogen-14 (N-14)?
A
7
B
8
C
6
D
9
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Identify the atomic number (Z) of nitrogen, which is the number of protons in the nucleus. For nitrogen, Z = 7.
Recognize that the isotope notation nitrogen-14 (N-14) indicates the mass number (A), which is the total number of protons and neutrons, is 14.
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: \(N = 14 - 7\), which gives the number of neutrons in nitrogen-14.
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