- The nucleus is the center of an atom
- Electrons orbit the nucleus of an atom
- Therefore, electrons orbit the center of an atom

- Electrons orbit the center of an atom
- Electrons are a part of an atom
- Hence, electrons are part of an atom that orbit the center of an atom

Hence, electrons are part of an atom that orbit the center of an atom
Question: What part of an atom orbits around the center of the atom?
Context: - The nucleus is the center of an atom 
- Electrons are a part of an atom 
- Electrons orbit the nucleus of an atom