Discovery/Theory card
![](https://phylogame.org/wp-content/themes/phylo/img/generated-card-images/br-46BAC3----1.png)
Discovery/Theory card
Planetary model of the atom![](https://phylogame.org/wp-content/uploads/2016/05/Screen-Shot-2016-05-01-at-8.25.05-PM.png)
Parker POINTS
Investigating the deflection of alpha particles by atoms lead to rethinking the nature of the atom / Large-angle deflections could not be explained by the old model / The change in the path of some alpha particles is due to a small, densely packed centre of positive charge called the nucleus.
Graphic by Eric Hamber Secondary