J. J. Thomson proposed the model of atom similar to a Christmas Pudding or similar to a watermelon. His model of atom is generally called plum and pudding model of atom.
He proposed that electrons are embedded in the way black seeds of watermelon are embedded; in the sphere of positive charge. According to Thomson
(a) An atom consists of positively charged sphere in which electrons are embedded.
(b) The quanta of negative and positive charges are equal. The equal number of negative charge and positive charge makes an atom electrically neutral.
