Which of the following elements, by mass, is the most abundant in the universe?
A)iron
B)oxygen
C)helium
D)nitrogen
E)carbon

Question

Quizplus · Accepted Answer

The most abundant element in the universe by mass is helium, comprising about 75% of all baryonic mass. The next most abundant element is hydrogen at roughly 24%. Other heavier elements such as oxygen, nitrogen, and carbon make up less than 1% of the universe's mass. Iron, despite being the most abundant heavy metal in the universe, makes up only a tiny fraction of the total mass.

Which of the Following Elements, by Mass, Is the Most