So I am having a bit of trouble wording my way thought this question, which indicated to me, I may not understand everything fully.
Here is the question Explain with reference to the liquid drop model why most alpha emitters have a larger mass number A>100.
So here are my key points I have made so far.
At higher levels of atomic mass the binding energy decreases which is due to the Colombo repulsion that occurs ate a rate of $z^2$
And this is where I am a bit hazy. The reason for the dominate effect of the Colombo force is due to the deformation of the nucleus which means that the surface term is decreasing and cant maintain the equilibrium state of the nucleus due to the Colombo repulsion.
The reason why an alpha particle is chosen is that is extremely stable due to it high binding energy and that compared to the mass od it constitutes i.e the protons and nurtons it is relatively low. Aslo alpha decay allow for a positive release of K.E, which I have a feeling and I am not sure this energy has something to do with the reduce mass energy, of the nucleus