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The identity of a chemical element is determined by which of the following?
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2. Atoms & Elements
The Atom
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Manganese has an atomic number of 25 and a mass number of 55. How many neutrons does a typical atom of manganese contain?
A
55
B
25
C
80
D
30
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Identify the atomic number (Z) of manganese, which is the number of protons in the nucleus. For manganese, Z = 25.
Identify the mass number (A) of manganese, which is the total number of protons and neutrons in the nucleus. For manganese, A = 55.
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 the number of neutrons: \(N = A - Z\).
Substitute the known values into the equation: \(N = 55 - 25\) to find the number of neutrons in a typical manganese atom.
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