What are the two most abundant elements in the Universe?
ক
Carbon and Oxygen
খ
Nitrogen and Oxygen
গ
Helium and Lithium
ঘ
Hydrogen and Helium
সঠিক উত্তর: Hydrogen and Helium
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.