Everyone at that time imagined the atom as a "plum pudding ... planets around the sun. In 1912 Bohr joined Rutherford. He realized that Rutherford's model wasn't quite right.

THE beautiful conception which inspires and co-ordinates practically the whole of modern atomic physics is the atomic model of Rutherford and Bohr. Its essential feature-the nucleus-was first put ...

Ernest Rutherford had recently suggested ... until they spiral down into the center, collapsing the atom. Bohr proposed adding to the model the new idea of quanta put forth by Max Planck in ...

In 1913, Niels Bohr revised Rutherford's model by suggesting ... have fixed levels of energy within each type of atom. Bohr's 'solar system' model of the atom is the way that most people think ...

From this, Rutherford proposed a revolutionary new model of the atom. He suggested that the atom ... the quantum theory later developed by Niels Bohr. In 1917, Rutherford made another monumental ...