Multiple Choice
Which property distinguishes isotopes of the same element from each other?
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2. Atoms & Elements
Isotopes
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Lithium has 3 protons. How many neutrons are present in the isotope lithium-8?
A
11
B
8
C
3
D
5
Verified step by step guidance1
Identify the atomic number of lithium, which is the number of protons. For lithium, this is given as 3 protons.
Understand that the isotope notation lithium-8 means the mass number (A) is 8. The mass number is the total number of protons and neutrons in the nucleus.
Use the relationship between mass number (A), protons (Z), and neutrons (N): \(A = Z + N\).
Rearrange the formula to solve for neutrons: \(N = A - Z\).
Substitute the known values: \(N = 8 - 3\), which gives the number of neutrons in lithium-8.
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