Atoms have been talked about for over 2000 years. Even before Christ was born, in the Greek era a couple of men called Democritus and Leucippus, these two men were the first people to have come up with the theory of atoms. The majority of the two Greek men's work has been lost. We only now have the writings of other people that quoted their work. They believed that all matter was composed of atoms and …showed first 75 words of 773 total…

…showed last 75 words of 773 total…energy is added or taken away from the atom the orbit takes another orbit. In 1915 Niel Bohr proposed the Bohr model. The model is very alike to a solar system with the nucleus like the sun and the electron cloud and the electrons like the solar system around it. His model shows electrons orbiting the nucleus, but when the electron gets a jolt of electromagnetic light, it changes its path. It does a Quantum leap.