Question

during which time period after the big bang were the first atoms being formed?
1 second to 20 seconds after the big bang
3 minutes to 20 minutes after the big bang
20 minutes to 37 minutes after the big bang
rewatch

Explanation:

The formation of the first atoms (nucleosynthesis) after the Big Bang occurred approximately 3 minutes to 20 minutes post - Big Bang. This is a well - known concept in cosmology (a subfield of Physics, which is part of Natural Science). During this time, protons and neutrons combined to form the nuclei of the first atoms (like hydrogen, helium, and a small amount of lithium). The other time periods do not align with the established scientific understanding of when the first atomic nuclei were formed.

Answer:

B. 3 minutes to 20 minutes after the Big Bang