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
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many neutrons are present in an atom of magnesium-25 (Mg-25)?
A
25
B
12
C
13
D
13
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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