15 out 1897 ano - 1897- J.J Thomson

Descrição:

J.J Thomson discovered the negative electrons. J.J Thomson's model is called Plum pudding. the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged “plums” surrounded by positively charged “pudding”. John Dalton present that all matter is made of small things called atoms and J.J Thomson present that atoms were made up of different charged partiles