Average binding energy per nucleon averages over nucleons near the center that a

Question

Average binding energy per nucleon averages over nucleons near the center that are more tightly bound and nucleons further away from the center that may be almost unbound. The largest semi-stable nucleus (it has a half life of 1.2 seconds) is Ununpentium (~286Uup113). There are no larger nuclei because any additional added nucleons would be unbound. Why is this?

1. Coulomb forces are long range and nuclear forces are short range.

2. Coulomb forces are short range and nuclear forces are long range.    

3. Both coulomb and nuclear forces are short range.

4. Both coulomb and nuclear forces are long range.

5. none of the above

I tried 2. but it was wrong answer which one is correct?

Explanation / Answer

1. Coulomb forces are long range and nuclear forces are short range.

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