dec 31, 1856 - J.J. Thompson
Description:
Discoveries- The electron- Determined the charge-to-mass ratio of a charged particle
- A charged particle is lighter than a hydrogen atom, the lightest atom
- Discovered that there are particles smaller than the atom
Experiments-
- Measured magnetic and electric fields and their effects on a cathode ray
Models-
- Created the “plum pudding model” which showed the distribution of positive charge
Added to timeline:
Date:
dec 31, 1856
Now
~ 169 years ago