We are being asked to identify the isotope that is expected to be stable
Recall that the stability of an isotope depends on the ratio of neutrons to protons (N/Z). This means for stable isotopes with:
• Z ≤ 20; the N/Z ratio should be equal to 1.0
• 20 < Z ≤ 40; the N/Z ratio should be equal to 1.25
• 40 < Z ≤ 80; the N/Z ratio should be equal to 1.50
• Z > 81; the stable nuclide does not exist
Also recall that the atomic mass is the sum of protons and neutrons and the atomic number tells us the number of protons.
Which of the following isotopes would you expect to be stable?
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Band of Stability concept. You can view video lessons to learn Band of Stability. Or if you need more Band of Stability practice, you can also practice Band of Stability practice problems.