Question detail
How do you calculate the number of neutrons in an atom?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Atoms and isotopes
Question
- A. Mass number minus atomic number.
- B. Atomic number minus mass number.
- C. Mass number plus atomic number.
- D. Atomic number plus mass number.
Answer
The correct answer is A: Mass number minus atomic number..
Explanation
The correct answer is A: Mass number minus atomic number.. This supports the learning objective "Compare the composition of two isotopes of the same element." in Mass number, atomic number and isotopes because it uses the correct atomic and nuclear radiation relationship for Atoms and isotopes. The other options are less suitable because they do not match the required Mass number, atomic number and isotopes idea: Atomic number minus mass number.; Mass number plus atomic number.; Atomic number plus mass number..
Common mistake
Isotope Composition Confusion
Students often confuse the number of protons and neutrons in isotopes, thinking they are the same for all isotopes of an element.
Remember that isotopes of the same element have the same number of protons but different numbers of neutrons, which affects their mass number.
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