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Atoms Are Interchangeable
- Atoms of the same type are identical and interchangeable everywhere.
- This interchangeability means the atoms in you are the same as those in a chair or tree.
Why Atoms Are Small
- Atoms are very small because complex organisms require many tiny building blocks.
- A limited set of small atom types can build the diversity and complexity of life.
What Atoms Are Made Of
- Atoms contain protons, neutrons, and electrons; protons and neutrons form the nucleus.
- Electrons orbit the nucleus, and protons are made of smaller particles called quarks.