Question detail
What defines an isotope of an element?
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. Isotopes have the same number of protons but different numbers of neutrons.
- B. Isotopes have different numbers of protons and neutrons.
- C. Isotopes have the same mass number.
- D. Isotopes are always radioactive.
Answer
The correct answer is A: Isotopes have the same number of protons but different numbers of neutrons..
Explanation
The correct answer is A: Isotopes have the same number of protons but different numbers of neutrons.. 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: Isotopes have different numbers of protons and neutrons.; Isotopes have the same mass number.; Isotopes are always radioactive..
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.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.