Multiple Choice
Which pair of atoms are isotopes of each other?
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- 1. Intro to General Chemistry3h 48m
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2. Atoms & Elements
Isotopes
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many neutrons are present in the isotope lithium-7?
A
3
B
4
C
7
D
5
Verified step by step guidance1
Identify the atomic number (Z) of lithium, which is the number of protons. For lithium, Z = 3.
Recognize that the isotope notation lithium-7 means the mass number (A) is 7. The mass number is the total number of protons and neutrons in the nucleus.
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: \(N = 7 - 3\), which gives the number of neutrons in lithium-7.
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