ELECTRONS IN AN ATOM

ELECTRONS are one of the subatomic particle seen in an atom. It is rotating the nucleus through a path called Orbit. They are negatively charged particle. If an atom loss or gain electrons, they become an ION. Electronwas discovered by J.J.THOMSON

DISCOVERY OF ELECTRON:-

Electrons are discovered through an expirement called DISCHARGE TUBE EXPIREMENT.Discharge tube is a long glass tube of 50cm length. Two metal electrodes are sealed at the two end of the tube. The inner surface is coated with the Zinc sulphide (ZnS).There is a side tube connected with the vacuum pump.The pressure is reduced to 1/10000 atm. And an eletric charge of 10000volt is applied accross the tube. ZnS infront of the tube glows .because of some rays coming from negatively charged electrode(cathode).this is named as cathode rays.