Multiple Choice
What is the mass number of the isotope lithium-7?
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4. Atoms and Elements
Isotopes
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In nature, bromine occurs primarily as two stable isotopes, 79Br and 81Br. Which isotope is slightly more abundant and therefore the most common isotope of bromine?
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Verified step by step guidance1
Understand that isotopes are atoms of the same element with different numbers of neutrons, resulting in different mass numbers.
Recognize that the problem asks which isotope of bromine is more abundant in nature, meaning which isotope has a higher natural percentage.
Recall that bromine naturally occurs mainly as two isotopes: \(^{79}\mathrm{Br}\) and \(^{81}\mathrm{Br}\).
Note that the isotope with the mass number 79 (\(^{79}\mathrm{Br}\)) is slightly more abundant than \(^{81}\mathrm{Br}\), making it the most common isotope of bromine.
Understand that isotopes like \(^{80}\mathrm{Br}\) and \(^{82}\mathrm{Br}\) are either unstable or much less common, so they do not represent the primary natural abundance.
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