Final answer:
Nuclear fusion is the process that forms elements larger than Hydrogen in the Sun, transforming hydrogen nuclei into helium and releasing energy.
Step-by-step explanation:
The nuclear process responsible for the development of elements larger than Hydrogen in the Sun is nuclear fusion. In the core of the Sun, extreme temperatures and pressures allow hydrogen nuclei (protons) to combine and form helium nuclei through a series of fusion reactions. When four hydrogen nuclei fuse, they form one helium nucleus, two positrons, and release a considerable amount of energy as mass is converted into energy. This fusion process not only produces energy that powers the Sun but also is essential for the creation of elements heavier than hydrogen in the universe.