Abat are isotopes? What is percent natural abundance of

Solution : The above figure illustrates Rutherford’s -Scattering experiment. In 1910, Rutherford with help of his -Scattering experiment discovered that almost all the particles passed directly through the gold foil without deflection, with a few particles deflected about 1°, which was consistent with Thomson’s plum-pudding model. Rutherford with help of Ernest Marsden, an undergraduate student working in the laboratory, looked for scattering at large angles for the completeness of result. When observed, a small amount of scattering was observed at large angles and some particles scattered back in the direction they come from. The explanation for these results were clearly inconsistent with Thomson’s plum-pudding model. Rutherford explained the results by postulating the nuclear model of the atom, in which most of the mass of each gold atom and all of its positive charge reside in a very small, extremely dense region which he called the nucleus. He postulated further that m ost of the volume of an atom is empty space in which ele ctrons move around the nucleus. Subsequent experiments led to the disc