27 sept. 1856 - JJ Thomson
Description:
Date: 1856 - 1940Country: United Kingdom
Observations/Experiments/Evidence: To test the properties of the particles, Thomson placed two oppositely-charged electric plates around the cathode ray. The cathode ray was deflected away from the negatively-charged electric plate and towards the positively-charged plate. This indicated that the cathode ray was composed of negatively-charged particles.
Discoveries/Conclusions: In Thomson's model, 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”
Contribution: Contributed to the development of the atomic theory which would shape our understanding of the world as a whole in the future.
Ajouté au bande de temps:
Date:
27 sept. 1856
Maintenaint
~ Il y a 168 ans