* Hydrogen (H): Makes up about 70-75% of a star's mass.

* Helium (He): Makes up about 24-28% of a star's mass.

These elements are the most abundant in the universe.

Other Elements: While hydrogen and helium dominate, stars also contain trace amounts of other elements, including:

* Oxygen (O)

* Carbon (C)

* Nitrogen (N)

* Neon (Ne)

* Iron (Fe)

* Silicon (Si)

* Magnesium (Mg)

* Sodium (Na)

* Calcium (Ca)

* And many more

Formation and Fusion: These heavier elements are actually formed within stars through nuclear fusion. Hydrogen atoms fuse together to form helium, releasing tremendous amounts of energy in the process. This process continues with heavier elements being formed from lighter ones in a chain reaction.

Important Note: The relative abundance of elements in a star can vary depending on its age, mass, and evolutionary stage.