Atomic structure

The discovery and understanding of the electron's emission from various metals were facilitated by the photoelectric effect. Thus atoms themselves must have a structure involving electrons. Thomson suggested the atom was positively charged, with negatively charged electrons embedded like raising in a pound cake. This led to further thinking about the atomic structure.
 Joseph John Thomson England 1904 Atomic structure

The discovery and understanding of the electron's emission from various metals were facilitated by the photoelectric effect. Thus atoms themselves must have a structure involving electrons. Thomson suggested the atom was positively charged, with negatively charged electrons embedded like raising in a pound cake. This led to further thinking about the atomic structure.