ATOMS — Physics STD 12 Science — Question

→Experiments by physicist J.J. Thomson showed that atoms of various elements contain negatively charged constituents (electrons). which are the same for all atoms. Although the atom is electrically neutral.
→Hence the atom must also have some positive charge to neutralise the negative charge of the electron.
→To explain the arrangement of positive and negative charge in atom, Thomson gave an atomic model called the plum pudding model.
→The first model of the atom was given by J.J. Thomson. According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in like seeds in a watermelon. This model is called plum pudding model of the atom.