Here's why:

* Nuclear Fusion: The Sun's energy comes from nuclear fusion, a process where hydrogen atoms fuse together to form helium.

* Composition: The Sun is composed of about 70.6% hydrogen and 27.4% helium by mass.

* Fusion Products: While helium is a product of fusion, it's not as abundant as hydrogen because it's constantly being used as fuel for further fusion reactions.

So, while helium is produced, hydrogen is the primary element present in abundance on the Sun.