Before the first stable nuclei were formed, what was the makeup of the universe?
A) hydrogen and helium
B) elementary particles
C) atoms
D) molecules
E) iron and oxygen

Question

Quizplus · Accepted Answer

Before the formation of stable nuclei, the universe existed as a hot dense plasma of elementary particles. It was only after the universe cooled down enough for protons to capture neutrons and form stable nuclei that hydrogen and helium atoms were created.

Before the First Stable Nuclei Were Formed, What Was the Makeup