Mitosis is FISSION. The combination of elements into other elements (by stars and supernovas) is called FUSION.
The first one means "splitting" while the second one means "combining".
And, cellular mitosis is not "mindless". It's simply a matter of a cell growing large enough that it needs to split into 2 parts. Whatever triggers the chromosomes into splitting into two parts (one for each new cell) is not "mindless", but designed into the "system".
Also, splitting uranium or plutonium atoms in an atomic bomb is also called "fission". A hydrogen bomb, conversely, combines hydrogen into helium just like the sun and releases energy via fusion.
Uranium is the heaviest NATURAL element because anything larger is atomically unstable and cannot exist for very long.
Think of a water drop in microgravity or zero gravity. If you tap the water sphere with your finger or a stick or whatever, it will deform, then try to return to a spherical shape. Eventually it will.
Now think of a larger water drop (or a "ball" of water). At a certain size, the water will deform and not have enough surface tension to return to a sphere, so it will continue to deform and eventually split (fission) into two smaller pieces that can easily return to a spherical shape.
Now, replace water drop with uranium and the tapping finger with a neutron and you see how NUCLEAR fission works. And you see why only the heaviest elements (Uranium, man-made Plutonium and only a few others) are fissionable. Smaller ones are too stable to be broken apart.
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