Bohr's 'solar system' model of the atom is the way that most ... However, there was still a difference between the atomic number of the atom and the atomic mass. Bohr and other scientists knew ...

Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from a very strange experience. Everyone at that time imagined the atom as a "plum pudding." That is ...

He suggested that an atom was a tiny solid ball. He published his ideas in 1803. This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of ...