Question

drawbacks of plum pudding model

Answer 1

The plum pudding model was proposed by J.J Thomsan
the results of experiments carried out by other scientists could not be explained by this model.

Answer 2

The orbital revolution of the electron is not expected to be stable. Any particle in a circular orbit would undergo acceleration. During acceleration, charged particles would radiate energy. Thus, the revolving electron would lose energy and finally fall into the nucleus. If this were so, the atom should be highly unstable and hence matter would not exist in the form that we know. We know that atoms are quite stable