Hydrogen.
Hydrogen
hydrogen
I suppose you mean "the most common chemical element". That would be hydrogen. Older stars, however, may have burned up most of their hydrogen and consist mainly of helium, or even heavier elements - the so-called "metals".
The most common element in a young star is hydrogen. During the star formation process, vast amounts of hydrogen gas collapse under gravity to form a new star. This hydrogen fuel is what powers nuclear fusion reactions in the star's core, creating energy and sustaining the star's brightness.
A spectrometer is used to measure properties of light. The most common usage is as an instrument attached to a telescope for astronomers to measure the chemical elements in a star.
H Hydrogen which is the lightest element that is highly flammable element and He Helium the second lightest element with no fire risk. This is why helium is used in making balloons than hydrogen which is much lighter than helium.
Stars contain hydrogen, helium and a little iron.
The most common type of star is the red dwarf.
The red dwarves.
The "star" topology is the most common.
red dwarfs
Through element no. 111, the most common letter out of all the symbols on the periodic chart is R (which occurs 16 times, second is S @ 13 times).