Niels Bohr

Rutherford would go on to describe the atom as a dense positive-charged core in the center of the atom. This was called the nucleus, and it is where the atom concentrated most of its mass. Negatively charged electrons orbited the nucleus. They didn’t make up much of the mass due to how light they were. His model was different from the ones before it, where scientists believed that atoms were solid instead of mostly empty space. Applications of this model to current models: