Question detail

Which of the following statements is true about isotopes?

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. Isotopes have different numbers of protons
B. Isotopes have the same number of neutrons
C. Isotopes have different mass numbers
D. Isotopes have the same chemical properties

Answer

The correct answer is C: Isotopes have different mass numbers.

Explanation

The correct answer is C: Isotopes have different mass numbers. This supports the learning objective "Define atomic number as the number of protons in the nucleus of an atom." 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: Isotopes have different numbers of protons; Isotopes have the same number of neutrons; Isotopes have the same chemical properties.

Common mistake

Confusing Atomic Number and Mass Number

Students often confuse atomic number with mass number, thinking both refer to the same quantity.

Remind students that atomic number is the number of protons in the nucleus, while mass number is the total number of protons and neutrons.

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