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.

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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 "Explain that isotopes of an element have different mass numbers because they contain different numbers of neutrons." 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

Misunderstanding Isotope Mass Numbers

Students often confuse isotopes by thinking they have the same mass number.

Remember that isotopes of an element have different mass numbers due to varying numbers of neutrons.

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