Multiple Choice
How many neutrons are present in the most abundant isotope of platinum?
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2. Atoms & Elements
Isotopes
Multiple Choice
Copper has two naturally occurring isotopes: copper-63 and copper-65. How many neutrons are present in an atom of copper-65?
A
34
B
36
C
29
D
65
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Verified step by step guidance1
Identify the isotope notation: copper-65 means the copper atom has a mass number (A) of 65.
Recall that the mass number (A) is the sum of protons (Z) and neutrons (N) in the nucleus: \(A = Z + N\).
Determine the atomic number (Z) of copper, which is the number of protons. For copper, \(Z = 29\).
Rearrange the formula to find the number of neutrons: \(N = A - Z\).
Substitute the values: \(N = 65 - 29\), which gives the number of neutrons in copper-65.
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