- A electron has a negative -1 electric charge
- An electron is a kind of charged particle
- So, an electron is a kind of negatively charged particle

- An electron is a kind of negatively charged particle
- Electrons are a part of an atom
- Therefore, electrons are part of an atom that is negatively-charged

- Electrons are part of an atom that is negatively-charged
- Electrons are involved in chemical reactions
- Therefore, negatively charged particles are involved in chemical reactions

So, negatively charged particles are involved in chemical reactions
Question: Which part of an atom is involved in chemical reactions?
Context: - A electron has a negative -1 electric charge 
- An electron is a kind of charged particle 
- Electrons are a part of an atom 
- Electrons are involved in chemical reactions