Exam-style question
Try this first
Which of the following statements is true about isotopes?.
- 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.
Model answer
What a good answer should say
- Isotopes have the same number of protons but different numbers of neutrons.
Explanation
Why this works
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, leading to different mass numbers.
Common mistake
No common mistake is linked to this question yet.