On the basis of the following conclusions, Rutherford put forward a nuclear model of an atom, which had the following features–ġ. This heavy, tiny, dense, positively charged central part of the atom is called nucleus. (iii) The deflection of a few particles over a wide angle of 1500 to 1800 indicates that all the positive charge and mass of the gold atom are concentrated in a very small volume within the atom. When alpha particles strike with heavy body having positive charge, they deflect, as similar charges repel each other. (ii) The deflection of a few particles shows that there is a ‘Centre of positive charge’ and it occupies a very little space. (i) The fact that majority of the particles went through the foil undeflected shows that most of the space occupied by an atom is empty. Rutherford explained these unexpected observations through following conclusions – A very few (1 out of 12000) alpha particles completely bounced back towards the source. Some of the alpha particles were deviated at small angles and a few were scattered at large angles.Most alpha particles passed straight without showing any deflection from their original path through the gold foil.(b) Since the alpha particles were much heavier than the protons, they would be deflected with little deflection (no large deflection).īut, the Rutherford’s Alpha Particles scattering experiment gave completely unexpected results. So, a positively charged body of an atom will repel another positively charged alpha particles. (a) all alpha particles would be deflected by the sub-atomic particles scattered in the gold atoms as same charges repel each other. The gold foil was about 1000 atoms thick. They selected the gold foil because they wanted as thin a layer as possible. They bombarded a very thin, gold foil with alpha particles from a radioactive source. Lord Rutherford (1911) and his coworkers performed an experiment. Magnetic Effects of Electric Current / All about Electro-magnetism.Human Eyes and Colorful World / Wonder of Light Part – I.Light – Reflection and Refraction / Wonder of Light Part-II.Force and Laws of Motion / The Laws of Motion.How do Organisms Reproduce? / The Life Cycle.Control and coordination / The Regulators of Life.LIFE PROCESSES / LIFE’s INTERNAL SECRETS. ![]() Improvement in Food Resources / Quality Food -Quality Life.
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