Multiple Choice
Vanadium (V) has two naturally occurring isotopes: V-50 and V-51. How many neutrons are present in the isotope V-51?
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2. Atoms & Elements
Isotopes
Multiple Choice
An isotope has a mass number of 193 and contains 116 neutrons. What is the atomic number of this isotope?
A
77
B
59
C
116
D
193
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Verified step by step guidance1
Recall that the mass number (A) of an isotope is the sum of the number of protons (atomic number, Z) and neutrons (N): \(A = Z + N\).
Identify the given values: mass number \(A = 193\) and number of neutrons \(N = 116\).
Rearrange the formula to solve for the atomic number (number of protons): \(Z = A - N\).
Substitute the known values into the equation: \(Z = 193 - 116\).
Calculate the difference to find the atomic number, which corresponds to the number of protons in the isotope.
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