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Fluorine’s most common isotope is (atomic number ). How many neutrons are in one atom of ?
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4. Atoms and Elements
Isotopes
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Which of the following correctly represents a bromine isotope that has 46 neutrons?
A
B
C
D
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Recall that an isotope is represented by the notation \(^{A}\text{X}\), where \(A\) is the mass number (total number of protons and neutrons) and \(\text{X}\) is the chemical symbol of the element.
Identify the atomic number (number of protons) of bromine (Br). Bromine has an atomic number of 35, meaning it has 35 protons.
Use the relationship between mass number (\(A\)), protons (\(Z\)), and neutrons (\(N\)): \(A = Z + N\).
Since the isotope has 46 neutrons, substitute \(Z = 35\) and \(N = 46\) into the equation to find the mass number: \(A = 35 + 46\).
Match the calculated mass number \(A\) with the given isotope options to determine which isotope correctly represents bromine with 46 neutrons.
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