Hydrogen and Helium.
The two most common ones are hydrogen and helium gas
Helium is most commonly found in natural gas deposits deep underground, where it is produced as a byproduct of the natural decay of radioactive elements. It is also found in small amounts in the Earth's atmosphere, although it is typically extracted from natural gas reserves.
Carbon
carbon and water
In stars and large gas giants.
Yes. All naturally occurring elements in the universe can be found in most stars, though generally only in small concentrations. Massive stars that have depleted the hydrogen in their cores may start producing elements as heavy as iron.
Basically all of them. However, most stars contain large amounts of hydrogen (since that's the most common element in the Universe), as well as helium, as well as smaller amounts of other elements.
The two main elements found in stars are hydrogen and helium. These elements are the most abundant in stars and are essential for nuclear fusion reactions that power a star's energy generation.
All of them - but mostly hydrogen & helium.
Most elements in nature exist in the form of compounds, where they are chemically bonded to other elements. In their pure form, elements can exist as solids, liquids, or gases depending on their properties and conditions. Elements in nature can also form minerals, rocks, and organic compounds through various natural processes.
The universe is mostly comprised of empty space and therefore the helium is found in certain places. It is found on Earth and some other planets, but it is most commonly found in stars such as the Sun.
The two most common elements in the Universe, and in most stars are - in that order - hydrogen and helium (elements #1 and #2).