Exam-style question
Try this first
Which of the following pairs correctly matches an element with its isotope that has a different neutron number?.
- A.Oxygen-16 and Oxygen-18
- B.Oxygen-16 and Oxygen-16
- C.Oxygen-16 and Oxygen-17
- D.Oxygen-16 and Oxygen-19
Model answer
What a good answer should say
- Oxygen-16 and Oxygen-18
Explanation
Why this works
Oxygen-16 has 8 neutrons; Oxygen-18 has 10 neutrons. Both have 8 protons, so they are isotopes of oxygen differing in neutron number, illustrating the concept of isotopes.
Common mistake
No common mistake is linked to this question yet.