Multiple Choice
In which of the following sets do all species have the same number of protons?
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2. Atoms & Elements
Isotopes
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Zinc has an atomic number of 30. How many neutrons are present in the most abundant isotope of zinc, Zn-64?
A
34
B
64
C
36
D
30
Verified step by step guidance1
Identify the atomic number of zinc, which is given as 30. The atomic number represents the number of protons in the nucleus of the atom.
Recognize that the isotope notation Zn-64 indicates the mass number of this isotope is 64. The mass number is the total number of protons and neutrons in the nucleus.
Use the relationship between mass number (A), atomic number (Z), and number of neutrons (N): \(A = Z + N\).
Rearrange the formula to solve for the number of neutrons: \(N = A - Z\).
Substitute the known values into the equation: \(N = 64 - 30\), which will give the number of neutrons in the most abundant isotope of zinc.
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