The element whose plasma form is found in the Sun is hydrogen.

Here's why:

* The Sun is primarily composed of hydrogen (about 70%) and helium (about 28%).

* Plasma is a state of matter where electrons are stripped from atoms, creating a mixture of ions and free electrons.

* The intense heat and pressure within the Sun's core cause hydrogen atoms to become ionized, forming a plasma.

So, the Sun's energy comes from nuclear fusion reactions happening in its core, which involve hydrogen ions fusing to form helium. This process is only possible because hydrogen exists in its plasma form within the Sun.