Radioactivity

Plum Pudding Model

Early, incorrect idea of the atom's form.

• 400BC, Greeks had the idea that everything was made of tiny atoms,without knowing what they looked like.
• 19th C, the idea of them containing negative particles embedded in positive ones arrived.
• Negative atoms scattered about in a region of positive charge like a plum pudding

Alpha Scattering Experiment

This was…