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| Proton & Neutron discovery |
Discovery of Proton
In since 1886 Eugene Goldstein observed that along that cathode rays other rays are also present in this discharge tube. These rays are appear in the shape of glow at opposite end of anode at back of perforated cathode. These rays come from anode and passed through the wholes present in the cathode. Their deflection in electric and magnetic field proved that they are positively charged and named as proton and the mass of these particles (Proton) are equal to the mass of electron.
Discovery of Neutron
In since 1920 Lord Rutherford observed that the mass of these particle are not equal to the mass of proton and electron only there are some neutral particle whose mass is almost equal to the mass of proton. After his suggestion James Chadwick work on it and at least James Chadwick proved that existence of neutron in an atom after two year hard work and he also get very popularity in very short period of time. He received noble peace price in since 1935 too. such as
Proton + Electron = Neutron
Proton (1.00782 a.m.u) + Electron (0.000548 a.m.u) = Neutron (1.008368 a.m.u)
where a.m.u shows Atomic Mass Unit.
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