The best discovery of the person sort and science is the electrons. After the invention of the electrons many idea and assumption modified. Historical past of discovery of electrons:- In 1896, the British scientist J. J. Thomson found cathode rays. He based that the ray will not be simply wave however they include the cost and mass as nicely. Atomic concept’s:- 1:-Thomson mannequin of atom:- he described the atom as an watermelon and the electrons because the seed embedded in it. His mannequin was dis carded by Rutherford and he gave his personal concept. 2:- Ernest Rutherford mannequin of atom:-his thought was primarily based on the idea that the proton is positively charged physique and is mounted within the heart referred to as nucleus and the electrons are revolving and on the finish falling into nucleus. 3:- Quantum mechanics:- the third thought was got here within the type of the quantum mechanics this clarify the how the electrons beneath sure situation behaves because the wave and particle nature each. He took the reference of the de Broglie wave to elucidate all that . Elementary properties of electrons :- :- The invariant lots of the electrons are y 9.109×10−31 kilograms. :- the cost of electron is −1.602×10−19 coulomb A very powerful property of the electrons is within the type of conductivity. The electrons are the key trigger within the conductivity within the steel. They’re the reason for circulate of present. They’re the reason for the even the warmth change within the steel. The variety of free electrons within the matter trigger the excessive or low conductivity of that materials and therefore primarily based on the conductivity the fabric are categorized into the steel, non-metal, semi-conductor. Metallic:- they’re these ingredient which have excessive conductivity and variety of valance electrons are extra in them and due to the great conductivity they’re thought of to be match for present circulate and warmth change . Non-metal:- these are these supplies which have the poor conductivity. As a result of much less current valance or free electrons. They’re by no means most popular for the warmth change or conduction objective. Semi-conductor:- they’re by way of conductivity are fall in between steel and non-metal . Significance of steel and semiconductor:- 1:- steel are utilized in making all of the excessive conductivity devise and as they’re robust they’re even utilized in constructing the robust constructing or any construction. 2:- semiconductor:- they’re used because the conduction after doping. The free electrons are elevated and therefore that will increase the conductivity.it main utilized in satellite tv for pc and photo voltaic cell. Pondering the existence with out the invention of the electrons is like nothing on this planet. all the fashionable know-how has are available in because of the information of electrons . Therefore, electrons do even matter and its information too.