Multiple Choice
Which statement correctly describes how isotopes of an element are similar and how they are different?
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2. Atoms & Elements
Isotopes
Multiple Choice
How many neutrons are present in an atom of magnesium-25 (Mg-25)?
A
25
B
12
C
13
D
13
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Verified step by step guidance1
Identify the atomic number (Z) of magnesium (Mg), which is the number of protons in the atom. For magnesium, Z = 12.
Recognize that the number 25 in magnesium-25 (Mg-25) is the mass number (A), which represents the total number of protons and 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 solve for neutrons: \(N = A - Z\).
Substitute the known values: \(N = 25 - 12\), which gives the number of neutrons in magnesium-25.
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