Thomson’s Atomic Model :
    J.J. Thomson  suggested that atoms are just positively charge lumps of matter with electrons embedded in them like raisins in a fruit cake. Thomson’s model called the ‘plum pudding’ model is illustrated in figure.

                                    
    Thomson played an important role in discovering the electron, through gas discharge tube by discovering cathode rays. His idea was taken seriously.
    But the real atom turned out to be quite different.