객관식
Which of the following best describes how radioactive isotopes differ from stable isotopes?
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2. Atoms & Elements
Isotopes
객관식
What is the mass number of the isotope lithium-7?
A
7
B
14
C
3
D
4
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검증된 단계별 안내1
Understand that the mass number of an isotope is the total number of protons and neutrons in its nucleus.
Recognize that the notation 'lithium-7' indicates the isotope of lithium with a mass number of 7.
Recall that the atomic number of lithium (number of protons) is 3.
Note that the mass number (7) is given directly in the isotope name, so it represents the sum of protons and neutrons.
Therefore, the mass number of lithium-7 is 7.
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