Multiple Choice
An Fe^{2+} ion has a mass number of 56. How many neutrons are present in a single Fe^{2+} atom?
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2. Atoms & Elements
The Atom
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The mass number of Fe^{2+} is 56. How many neutrons are present in a single Fe^{2+} atom?
A
28
B
58
C
30
D
56
Verified step by step guidance1
Identify the mass number (A) of the Fe^{2+} ion, which is given as 56. The mass number represents the total number of protons and neutrons in the nucleus.
Determine the atomic number (Z) of iron (Fe), which is the number of protons. For iron, Z = 26.
Recall that the charge of the ion (2+) indicates the loss of 2 electrons, but this does not affect the number of protons or neutrons in the nucleus.
Use the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to find the number of neutrons: \(N = A - Z\). Substitute the values to get \(N = 56 - 26\).
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