called electron shells, around the nucleus. New evidence The discovery of electrons. Changes to the atomic model Atoms can be broken down into smaller parts. An atom is made of tiny negatively ...

He realized that Rutherford's model wasn't quite right ... Thus when an atom absorbs or gives off energy (as in light or heat), the electron jumps to higher or lower orbits.

He realized that Rutherford's model wasn't quite right ... Thus when an atom absorbs or gives off energy (as in light or heat), the electron jumps to higher or lower orbits.