In fusion two or more lighter nuclei combine to form a comparatively heavier nucleus. When binding energy per nucleon increases for a nuclear process, energy is released. In fission, a 

heavy nucleus breaks into two or more lighter

nuclei.

(a)  For 1<A<50, on fusion mass number of the resulting nucleus will be less than 100.

(b)  For 51<A<100, on fusion mass number the resulting nucleus is between 100 and 200. B/A increases, energy will be released.

(c)  On fission for 100<A< 200, the mass number for fission nuclei will be between 50 to 100. B/A decreases, no energy will be released.

(d)  On fission for 200<A<260, the mass number for fission nuclei will be between 100 to 130, B/A will increase, energy will be released.