The 'plum pudding' model of the atom was proposed by JJ Thomson, who had also discovered the electron. It was put forth before the discovery of the nucleus.

An atom is made of tiny negatively charged electrons dotted about a positively charged sphere like a plum pudding. 1909-1911 Rutherford (and Geiger and Marsden) ...

Everyone at that time imagined the atom as a "plum pudding." That is, it was roughly the same consistency throughout, with negatively-charged electrons scattered about in it like raisins in a pudding.

Protons are tiny particles just a femtometer across, but without them, atoms wouldn't exist. Protons are tiny subatomic particles that, along with neutrons, form the nucleus of an atom. The ...

The atom has fascinated scientists for thousands of years and is the building brick which makes up all matter. But have you heard of the ‘plum pudding’ model when it comes to the atom ...