Multiple Choice
Which of the following is an isotope of lithium?
2
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4. Atoms and Elements
Isotopes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many neutrons are in a atom?
A
6
B
0
C
4
D
2
Verified step by step guidance1
Identify the isotope notation given: \(\mathrm{He}^{4}\). The superscript 4 represents the mass number (A), which is the total number of protons and neutrons in the nucleus.
Recall that the atomic number (Z) of helium (He) is 2, which means it has 2 protons.
Use the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to solve for neutrons: \(N = A - Z\).
Substitute the known values: \(N = 4 - 2\), which gives the number of neutrons in the helium-4 atom.
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