The MOST common elements in the universe are
A) about equal amounts of all elements up to iron but very little of any heavier elements.
B) hydrogen and helium, with small amounts of heavier elements.
C) nitrogen and oxygen, with smaller quantities of hydrogen, helium, and heavier elements.
D) heavy elements, with smaller quantities of hydrogen and helium.

Question

Quizplus · Accepted Answer

Hydrogen and helium are the most abundant elements in the universe, making up about 98% of the observable universe's elemental mass. These elements were formed in the earliest moments of the universe's existence, during the Big Bang nucleosynthesis. Heavier elements are formed in the cores of stars and during supernova explosions, but in much smaller quantities.

The MOST Common Elements in the Universe Are