SSC MTS EXAM

Detailed explanation-1: -J.J. Thomson’s discovery of the negatively charged electron had raised theoretical problems for physicists as early as 1897, because atoms as a whole are electrically neutral.

Detailed explanation-2: -Thomson proposed his atomic model saying that the negatively charged electrons are embedded in a sphere of positive charge. He is the one who discovered the negatively charged particle called the electron in the cathode ray experiment.

Detailed explanation-3: -In 1897 Thomson discovered the electron and then went on to propose a model for the structure of the atom. His work also led to the invention of the mass spectrograph. The British physicist Joseph John (J. J.)

Detailed explanation-4: -In 1897, J. J. Thomson discovered the first subatomic particle, the electron, while researching cathode rays. To explain the neutrality of atoms, Thomson proposed a model of the atom in which negative electrons are scattered throughout a sphere of positive charge. He called his atom the plum pudding model.