3.1 Describe the chain of events that led from the big bang to the atoms that make up your body (For example, how were atoms like hydrogen, carbon, oxygen, and iron formed?).
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12 Terms
When did the Big Bang occur?
13.8 billion years ago
What particles existed right after the Big Bang?
Quarks and electrons (no atoms yet)
When did protons and neutrons form?
1 microsecond after the Big Bang
What elements were created a few minutes after the Big Bang?
Hydrogen (H), helium (He), and lithium (Li)
Why did fusion stop after a few minutes?
The universe cooled too much for further fusion
What happened a billion years after the Big Bang?
Matter clumped together due to gravity, forming stars
What reaction occurs in stars to form helium?
Hydrogen burning:
4 H → He + energy
How were carbon and oxygen formed?
Helium fusion inside stars
How was iron formed?
Fusion in massive stars before supernova explosions
How were elements heavier than iron formed?
Supernova explosions
How did elements like carbon, oxygen, and iron reach Earth?
Supernovae scattered them into space, where they became part of the solar system
What are the main sources of the atoms in our bodies?
Hydrogen from the Big Bang
Carbon & oxygen from stars
Iron from supernovae