In Rutherford’s experiment most of α-particles were scattered by small angles of the order of a few degrees. A few α-particles about 1 in 8000, get deflected through 90° or more. To explain this, Rutherford concluded that all the positive charge and the mass of the atom is concentrated in a very small central region called the nucleus of the atom and the size of the nucleus was observed to be \(\frac{1}{10,000}\) the size of the atom.
