It is easier to remove a nucleon from nucleus X than nucleus Y. X has _____________ binding energy per nucleon than Y?
Oh yes, you are on the right path! Don’t you worry! Its very simple my friend, if nucleus X is more ready to give off a nucleon than nucleus Y, what does it imply? Yes, it implies that the nucleus Y is more tightly bound than nucleus X. And…..yes yes yes…...now you got it, this means that X has lower binding energy per nucleon than Y!