Kim described two subatomic particles below: 
 Particle P: Has the least mass
 Particle Q: A more massive particle with a charge 
 Which of the following statements is correct based on the descriptions of each particle?
 Particle P repels Particle Q. 
 Particle P attracts Particle Q. 
 Particle P is a neutron and Particle Q is a proton. 
 Particle P is a proton and Particle Q is an electron.