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Which statement best describes an isotope such as carbon-14?
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4. Atoms and Elements
Isotopes
Scelta multipla
What is the mass number of the isotope lithium-7?
A
B
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D
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Understand that the mass number of an isotope is the total number of protons and neutrons in its nucleus.
Identify the element lithium, which has an atomic number of 3, meaning it has 3 protons.
Recognize that the isotope notation lithium-7 indicates the mass number is 7.
Recall that the mass number (A) is given by the formula: \(A = \text{number of protons} + \text{number of neutrons}\).
Since lithium has 3 protons, calculate the number of neutrons by subtracting the atomic number from the mass number: \(7 - 3 = 4\) neutrons.
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