The plum pudding model is one of several historical scientific models of the atom . First proposed by J. J. Thomson in 1904 soon after the discovery of the electron but before the discovery of the atomic nucleus the model tried to explain two properties of atoms then known: that electrons are negatively charged particles and that atoms have no net electric charge.
Sun Feb 24 2002 13:30:00 GMT-0500 (Eastern Standard Time) · Atomic theory is the scientific theory that matter is composed of particles called atoms.Atomic theory traces its origins to an ancient philosophical tradition known as atomism.According to this idea if one were to take a lump of matter and cut it into ever smaller pieces one would eventually reach a point where the pieces could not be further cut into anything smaller.
Atomic orbital – Wikipedia
Discovery of nuclear fission – Wikipedia
The atomic nucleus is the small dense region consisting of protons and neutrons …