CHEM BRAIN

  

1. The electron was discovered by J.J Thomson during the study of cathode rays.
2. The term electron was coined by J. L. stoney 

  

Proton(₁P¹):

1. The proton was discovered by Goldstein during the study of anode rays 
2. The term proton was coined by Rutherford 

  

Neutron(_on¹): 

1. The neutron was discovered by Chad-wick
2. The neutron was discovered later because it is chargeless. 

  

Atomic number= Z = e = p 

  

Atomic mass= atomic weight= Mass number= A= n + p