The actual speed at which an atomic nucleus turns, can be determined with an atomic bomb. If you know the explosive yield, such as 20 megatons/ and you know exactly how many atoms was inside the atomic fuel that exploded. Then you know how much energy each atom represents/ its atomic weight/ and how fast each must turn to release the kinetic energy that is stored in each atom of the element used. Atomic energy is again: the reality of spin as depicted in each atomic nucleus. That spin establishes its own sustainability, because it is “so fast”. Roughly speed of light squared. Every mass that has speed/ has force, through its momentum.
That reality of spin literally means: YOU CAN’T force one atomic nuclei to combine with another atomic nuclei to change the element. The spin will never let you. Which does mean “fusion” is for fools.