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(a) Write the name of the sub – atomic particle discovered by J. Chadwick. What type of charge occurs on this particle? In which part of an atom this particle is located?
(b) List three steps of an experiment performed by Rutherford for his model of an atom.
(c) Define isobar, write its one example.
(d) Which scientist concluded that the size of the nucleus is very small as compared to the size of an atom?