Explain Rutherford 's nuclear of an atom . What are its drawbacks ?

Explanation

In 1910 , Rutherford proposed a model of the atom to explain the results of his experiment . It is called , Planetary model or Nuclear model of atom . The main features of the model are given below.
1) Atom is spherical and mostly hollow .
2) The positive charge and the mass of the atom is concentrated in a small region at the center of the atom . The region is called, 'Nucleus'.
3) Te electrons present outside the nucleus (called , extra -nuclear electrons) are equal in number to the protons inside the nucleus.
4) Just as the planets revolve around the Sun , the electrons revolve around the nucleus.
5 ) The revolving electron is under the influence of two forces -i) The centripetal force of attraction towards nucleus and ii) the centrifugal force directed away from the orbiting path. These two forces being equal and opposite , balance each other and the electron continues to move in its orbit .
Drawbacks in Rutherford's Model:

i) Accordings to electrodynamics , any charged particle moving under the influence of opposite charge should lose energy continuously , come closer and closer to the nucleus in a spiral path and ultimately fall in the nucleus as shown in figure . Then the atom shall collapse due to the merging of electrons with the nucleus . But it is not happening .
ii) If the electrons lose energy continuously , the atomic spectrum should have a continuous band . But the atomic spectrum of the elements are found to contain discrete lines .