Spec 8463
Revise AQA GCSE Physics 4.1.3 The development of the model of the atom (common content with chemistry) with the question bank, lessons, revision guides, and flashcards.
New experimental evidence may lead to a scientific model being changed or replaced. • Before the discovery of the electron, atoms were thought to be tiny spheres that could not be divided. • The discovery of the electron led to the plum pudding model of the atom. The plum pudding model suggested that the atom is a ball of positive charge with negative electrons embedded in it. • The results from the alpha particle scattering experiment led to the conclusion that the mass of an atom was concentrated at the centre (nucleus) and that the nucleus was charged. This nuclear model replaced the plum pudding model.
