what are the postulates of JJ Thomson and Rutherford Model of an atom class 9th CBSE
Answers
A Thomson
By his experiments from 1891-1897 j. j in 1898 Thomson told that atom is the same charged sphere (radius believe10m) in which the concentration is equally opposite. The electrons are thus placed to give a stable and permanent electrical order. Different kinds of names have been given to this nuclear model.
rutherford
Rutherford 's atomic model is the model of an atom made by the famous chemist and physicist, Ernest rutherford. Rutherford gave this model by the experiments of his electron of 1911. This model explained the location of the charged portion within the atom. He made an experiment to describe it!
Rutherford carried a shower of alpha particles on the 100 nanometres of gold foil. A photographic plate placed around the gold foil coated with fluorescent substance with zinc sulphide.
Answer:
according to him following observations were made:
1 most of the fast moving autumn particles passed straight through the gold foil.
2 some of the atom particles were deflected by the foil by small angles.
3 surprisingly one out of every 12000 particles appeared to rebound.