Explain why Mo–95 & La–139 are more stable than U–235

[Bolter]

Homework Statement

See question below

Relevant Equations

None

Hey everyone!

So I have attempted this Q which is shown below

I had a go at all the parts and I think they are right
but I'm not so sure on what answer to give for c)iii, I mentioned about the ratio of protons to neutrons but I'm not sure if that is necessary over here?

Any help would be grateful! Thanks

 

[ORF]

Hi,

The Semiempirical Mass formula gives an idea of binding energy in nuclei. It treats the nuclei as fluid, so a number of terms are introduced: volume, surface tension, coulomb repulsion among protons, symmetry, and pairing neutron-proton.
https://en.wikipedia.org/wiki/Semi-empirical_mass_formula

There are a number of factors that weaken heavy nuclei, the most important is the Coulomb repulsion among protons. In this graph, each component of the mass formula is displayed, so you can see which one changes the most from A~240, to A~100.
https://www.slideserve.com/sasha/the-semi-empirical-mass-formula

I hope it helps.

Regards,
ORF