For a given mass, the energy released is greatest for a reaction involving nuclear fusion.
Nuclear reactions generally release far much more energy compared to chemical energy because they involve the interaction between strong nuclear forces. There are two main types of nuclear reactions which are fusion and fission.
Nuclear fusion powers the sun and releases the greatest amount of energy.
In nuclear fusion, light atoms combines to form heavier ones.
The reaction degenerates into chain reaction in which huge amount of energy is released.
This reaction occurs in the core of sun and furnishes the solar system with radiant energy.
