1. ~ ~ THE THOMSON MODEL OF THE ATOM In 1898 ,Thompson surveyed all the evidence that the atoms consist of charged particles . he described an atom as a sphere of positive electricity , in which negative electrons are embedded . Other people described this as the ‘plum-pudding’ model . MODELS OF THE ATOM

2. REASONS FOR BEING WRONG If this model of the atom is correct , then a metal foil is a film of positive electricity containing electrons .A beam of alpha particles fired at it should pass straight through . in 1909 ,Lord Rutherford’s colleagues Geiger and Marsden tested this prediction.

4. PICTURE OF GEIGER AND MARDEN EXPERIMENT

7. Rutherford atomic model

10. Mosely