Neutron Capture

Note: S-process material predicts proton rich heavy nuclei
R-process material predicts neutron rich heavy material.

On earth, ²³⁵U (1/2 life of 750 million years) comes from S-process and is reactor core fuel.

but ²³⁸U (1/2 life of 4.5 billion years) comes from R-process and this drives plate tectonics.

The Solar system has both R and S process material in it.

As a result, the remnants of supernova contain the entire periodic table of elements.