Very nice! All three ways of arranging it seem equally possible. Without conducting more experiments, it wasn't possible to decide which of them was correct.
Scientist J J Thomson proposed a model of the atom. He said that the atom was a sphere of positive charge with negative charges stuck at different places.

Think of a watermelon. The red part of the watermelon that is spread throughout is like the protons. The seeds that are located in this red region are like the electrons.