The first elements to form after "Big Bang" were______ .
A) oxygen and hydrogen
B) oxygen and iron
C) helium and hydrogen
D) hydrogen and iron
E) helium and oxygen

Question

Quizplus · Accepted Answer

According to the Big Bang theory, the first elements to form were hydrogen and helium. This is because the universe was too hot and too dense for any heavier elements to form initially. It wasn't until a later stage in the evolution of the universe, through the process of nuclear fusion in stars, that heavier elements like oxygen and iron were formed. Therefore, the best choice is C, which includes the two elements that are believed to have formed first.

The First Elements to Form After "Big Bang" Were______