jan 1, 1904 - Plum Pudding Atomic Model* 1904 - 1909
Description:
The plum pudding model is one of several scientific models of the atom. First proposed by J. J. Thomson in 1904[1] soon after the discovery of the electron, but before the discovery of the atomic nucleus, the model represented an attempt to consolidate the known properties of atoms at the time.electrons are negatively-charged particles and atoms are neutrally-charged.
Added to timeline:
Date:
jan 1, 1904
Now
~ 121 years ago