29 дек 1855 г. - J.J. Thomson
Описание:
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.Добавлено на ленту времени:
Дата:
29 дек 1855 г.
Сейчас
~ 169 г назад