- A neutron has a neutral electric charge
- One neutron has one atomic mass unit
- Therefore, a neutron is neutral in electric charge and has one atomic mass unit

- A neutron is neutral in electric charge and has one atomic mass unit
- Neutrons are a kind of subatomic particle
- Hence, a neutron is a particle that is neutral in electric charge and has one atomic mass unit

So, a neutron is a particle that is neutral in electric charge and has one atomic mass unit
Q: What particle always has a mass of one atomic mass unit (amu) and no charge?
Context:
- Neutrons are a kind of subatomic particle 
- A neutron has a neutral electric charge 
- One neutron has one atomic mass unit