Development of the atom

Development:

Daltons Model - John Dalton thought of the atom as a solid sphere that could not be divided into smaller parts. His model did not include protons, neutrons and electrons.

The Plum Pudding Model - Scientists experiments resulted in the discovery of sub-atomic charged particles. The first to be discovered were electrons - tiny, negatively charged particles.

Alpha Scattering experiment - Scientists fired small, postivley charged particles at a piece of gold foil only a few atoms thick. They expected the alpha particles to travel straught through the gold. They were suprised that some of the alpha particles bounced back and many were deflected. To explain why the alpha particles were repelled the scientists suggested that the postive charge and mass of an atom must be…