Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from ... about in it like raisins in a pudding. As part of an experiment with x-rays in 1909, Rutherford was ...

THE theory of atomic structure has, during the past few years, reached a stage of sufficient success and stability for it to be possible to describe many of its features in a simple manner.

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 charged electrons dotted about a positively ...