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O toppr, STRUCTURE OF ATOM, Atomic Nucleus, Centre of an atom constituting, positively charged particles, "protons" and uncharged, particles "neutrons", • Extra nucleus, larger region which is, composed of a cloud of, negatively charged, particles called an electron, Protons, Discovered by Rutherford, Contributes positive charge, ..... Electrons, Discovered by JJ.Thomson, Revolve around centre of, of the atom, nucleus, Lead block, A small bit of, -Radioactive source, Beam particles, electricity passes, Electricity passes from the through, from the cathode the hole in the, to anode, Gold foll Neutrons i, anode, Discovered by James Chadwick, by using scattered particle to, calculate mass of the neutral, Undeflected beam particle, Cathode, Anode, To Vacuum, Unknown, Phosphor coating, radiation, Protons, dund, To amplifier, To oscillograph, Source, Protons Neutrons- Nucleons, Orbit, The central nucleus consists of, protons and neutrons. Containing, almost all the mass of the atom., the nucleus of an atom is very small, compared to the size of the atom., Nucleus ., Electron, the elelctrons are orbiting outside, the nucleus in the electron shells., the elelctrons are moving in, electron shells at very high speed., Neutron, • Proton, Comparison of Subatomic Particles, Particles, Location, Charge(C), Mass(g), Mass(amu), Proton, Inside nucleus, 1.6 02 x 1019, 1.67 x 1024, 1.00073=1, Neutron, Inside nucleus, 1.68 x 1024, 1.00087=1, Electron, Outside nucteus, -1.6 02 x 1019, 9.11 x 1024, 0.0006=0