In Science, went to atom slam together to form a heavier atom this phenomena is called fusion.
Went two atoms slam together to form a heavier item this process is called nuclear fusion in science.
When they are to unstable atoms they combine with each other in order to form a stable atom that is much more heavier.
In the process of recombination energy is released by the items which can be given by the mass energy equivalence,
E = ∆mc²
Where,
∆m is the change in mass during the recombination and c is the speed of light.
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