![]() ![]() A very few α-particles (~1 in 20,000)bounced back, that is, were deflected by nearly 1800. A small fraction of α-particles was deflected by small angles. Drawbacks: One major drawback is that it could not explained the Rutherford’s Alpha Scattering Experiment, hence rejected.Ĭlick Here If Animations are not Working Rutherford’s α-Scattering Experiment Click Here To See Experiment And Its Results Observation: Most of the α-particles passed through the gold foil. Stability of atom was explained on the basis of attraction between positively and negatively charged protons and electrons respectively. Thomson model of Atom In 1904, Thomson proposed that atom is a sphere of positively charged particles in which negatively charged electrons are embedded. Anode rays are not emitted from anode but from a space between anode and cathode.Ĭlick Here If Animations are not Working J.J. So, these rays consists of positively charged particles called Protons and these rays are called Anode rays. He observed new type of luminous rays passing through perforations of cathode and moving in directions opposite to cathode rays. Thomson who discovered electronsĬlick Here If Animations are Not Working Click Here If Animations are not Working Discovery of Protons( Anode Rays) In 1886, Goldstein performed discharge tube experiment with certain modifications as shown in figure. As J.J.Thomson studied the properties of cathode rays which led to the discovery of electrons so, its J.J. So, cathode rays consists of negatively charged particles and they were named as Electrons. Cathode rays consists of negatively charged particles.Ĭlick Here If Animations are not Working Discovery of electrons As cathode rays are made up of material particles which are attracted towards the positively charged plate. Cathode rays are made up of material particles. Result : Fluorescence is due to rays emitted from cathode and hence these rays are called cathode rays.Ĭlick Here If Animations are not Working Properties of cathode ray J.J.Thomson studied the important properties of cathode rays as follows: Click The Following To Study : Cathode rays travel in a straight line. Further decrease in pressure stops emission of light but walls opposite to cathode starts glowing and this is called fluorescence. Observations : No current flows at 1 atm pressure even at high voltage (about 104 V ) When pressure is reduced to 10-2 atm, gas is found to emit light which depends upon the nature of gas. In cylindrical glass tube as shown in figure. ![]() Scientists work hard to discover the sub-atomic particles and those experiments are as….Ĭlick Here If Animations are not Working Discharge Tube Experiment Click here to play William Crooks performed this exp. ![]() These ideas remain dormant for a very long time and were revived again by scientists in nineteenth century. The word atom has been derived from the Greek word “a-tomio” which means uncut able or non-divisible. Photoelectric effect.ģ Click Here If Animations are not Workingĭiscovery of atom The existence of atom has been proposed since the time of early Indian and Greek philosophers(400 B.C.) who were of the view that atoms are the fundamental building blocks of matter. Rutherford’s Alpha scattering experiment. Thomson, Rutherford and Bohr atomic models. Structure of Atom A project to elaborate the discovery and advancement in the field of existence of atom and its various fundamental particlesĢ After this animation you will be able toĬlick Here If Animations are Not Working Click Here If Animations are not Working After this animation you will be able to Know more about the discovery of electron, proton and neutron. 1 Click Here If Animations are Not Working ![]()
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