<P> Hydrogen is the most abundant element in the Universe ; helium is second . However , after this , the rank of abundance does not continue to correspond to the atomic number ; oxygen has abundance rank 3 , but atomic number 8 . All others are substantially less common . </P>
<P> Hydrogen is the most abundant element in the Universe ; helium is second . However , after this , the rank of abundance does not continue to correspond to the atomic number ; oxygen has abundance rank 3 , but atomic number 8 . All others are substantially less common . </P>
what are the 2 most common elements in the universe
what are the 2 most common elements in the universe
Hydrogen helium
Hydrogen helium