* Nuclear Fusion: This process involves the merging of atomic nuclei to create a heavier nucleus. The most common type of nuclear fusion is the fusion of hydrogen isotopes (like deuterium and tritium) to produce helium.

* Helium-4: Helium-4 is the most common isotope of helium and is a stable product of nuclear fusion reactions.

* Hydrogen-1: This is a primary fuel source for fusion reactions, not a product.

* Uranium-235 & Uranium-238: These are heavy elements involved in nuclear fission (the splitting of atoms), not fusion.

In summary: Nuclear fusion typically involves light elements like hydrogen fusing to produce heavier elements like helium.