I think I am confused between the mass defect of just splitting up a nucleus into its component nucleons and the mass defect involved between the two sides of a nuclear transmutation reaction. I assume the problem refers to the second, and the answer is B by just plugging in the numbers of the table. However can somehow please explain why the mass of the left side of the reaction is less than the right? I thought when you SPLIT up an atom (as in the Lithium to 2 Heliums) you have to put in energy therefore the mass-energy should be higher in the product side?
Thanks in advance!