29 déc. 1855 - J.J. Thomson
Description:
Development of the Atomic Theory. In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged.Ajouté au bande de temps:
Date:
29 déc. 1855
Maintenaint
~ Il y a 169 ans