How did find the electron

What is the electron?The atom is made by electrons,protons and neutrons.Philosopher assume there must be atom in element.it is the smallest part of the element.Also Philosopher have said that there is a another smallest part in atoms after J.J.thomson`s experiment of Cathode Ray.Thomson show that there was some of atoms.



What is experiment of cathode ray?


 

One end is negative and other end is positive.There is very low pressure in tube.When we decrease the pressure we will see some rays as a light.
watch this vedio 
     If we approximate negative plate and positive plate part as shown fig below to this tube ,The rays will remove as shown fig below.

Then we can decide which charged has to cathode ray.So J.J.thomson decided that cathode ray has negatively charged.You can also understand this.
      what happened in this experiment?When we decrease the pressure we will see some rays as a light.It was negatively charged.
      If we put a  paddle wheel as shown fig below you will see that it remove as shown below


watch also this vedio


What can we decide rom this result of cathode ray experiment?.Cathode ray has some momentum.
  accissibility = mass x  velocity
So we can decide cathode ray has some mass.


How to generate cathode ray?.



In this fig cathode has negative charged and Anode has positive charged.When the pressure is decreased , some negatively charged parts of cathode start to remove to anode as cathode ray.This ray was negatively charged and it had some mass.Cathode is made by a metals(element).metals are made by atoms.But we know that element has neutral charged because trees,metals,rocks,animal has neutral charged.We know that elements are made from atoms.So atoms must have a neutral charged.But we could see some negatively charged parts of cathode ray remove to anode from cathode.
     So thomson decided that there must be some negatively charged parts of the atom.This negatively charged part is called as ELECTRON by Thomson.