JJ THOMSON ATOMIC MODEL
(a) An atom consists of positively charged sphere in which electrons are embedded.
(b) The negative and positive charges are equal. The equal number of negative charge and positive charge makes an atom electrically neutral.
RUTHERFORD ATOMIC MODEL
(a) Most of the part in an atom is empty.
(b) There is a positively charged center in atom, which contains nearly the whole mass of atom. The centre is called nucleus.
(c) The size of nucleus is very small compared to an atom.
d) Electrons revolve round the nucleus.