![]() The deflections of the a-particles to large angles indicate that the a-particles has direct collision with the positively charged nucleus. The a-particle get deflected from their normal path when they came close to nucleus due to force of repulsion (similar charges). This positively charged heavy mass in the centre of the atom is called nucleus. Moreover, this mass must be occupying a very small space within the atom because only a few a-particles suffered large deflections. This must be containing the whole mass of the atom. There is a positive tiny part in the atom in its centre, which deflects or repels the a-particles. Therefore, most of the a-particles went through the gold foil without deflecting from their path. Most of the space inside the atom is empty. The main conclusions of Rutherford’s experiment : How has the Model of the Atom Changed Over the Years?.What is the Definition of Atom and Molecule.What did Dalton Contribute to the Understanding of the Atom.What are the Isotopes, Isobars and Isotones of an Element.Explain Bohr Bury rules for Distribution of Electrons into Different Shells.What are the Characteristics of Electron, Proton and Neutron.What did Bohr Contribute to the Theory of an Atom. ![]() How would you describe the Structure of an Atom.Very few (about 1 in 12,000) did not pass through the foil at all but suffered large deflections (more than 90º) or even came back in the direction from which they came.Some of the a-particles were deflected from their path through small angles.Most of the fast moving a-particles passed straight through the gold foil without any deflection from their original path.These are emitted from radioactive elements such as radium. The alpha particles are positively charged helium ions (He2+) which carry two units of positive charge and mass four times that of an atom of hydrogen (i.e., mass of helium ions = 4 a.m.u.). They took very thin sheets of gold foil (only 4 × 10–5 cm thick) and bombarded it with a stream of alpha (a) particles. They performed a number of experiments known as scattering experiments. Rutherford and his co-workers made a fundamental contribution in understanding the structure of the atom and establishing the presence of a small nucleus in the atom. What was Rutherford’s Original Hypothesis
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