The same as all stars, hydrogen.
All elements up to Iron are found in very star (except for very young stars as they have not reached that point yet). Though most of the elements are hydrogen and helium.
betelgeuse
No. Betelgeuse does not affect us.
No, Betelgeuse is a red star.
No. Betelgeuse is a single star.
No, the name Betelgeuse comes from Arabic.
Betelgeuse is a supergiant star.
No, Betelgeuse is a red giant star.
No. Betelgeuse is in Orion.
Betelgeuse is brighter.
Yes, there is a star named Betelgeuse. Betelgeuse is a red star located on the constellation of Orion.