Here is a diagram of his experiment ... Bohr model that is no longer accepted in current models of the atom. In the Bohr model, the electrons are still thought to orbit the nucleus just like ...

Bohr’s Model of an Atom: Danish Physicist Niels Bohr received his Ph.D. from the University of Copenhagen in 1911. In 1922, he was awarded the Nobel Prize in Physics for his work on the atom’s ...

Everyone at that time imagined the atom as a "plum pudding ... He realized that Rutherford's model wasn't quite right. By all rules of classical physics, it should be very unstable.

Since a nucleus contains protons and neutrons, most of the mass of an atom is concentrated in its nucleus. Protons and electrons have opposite electrical charges.