In the Geiger-Marsden (alpha particle scattering) experiment, a very small fraction of the alpha particles are deflected through large angles (greater than 90∘90^\circ90∘).
What does this observation reveal about the nature of the atom?
The atom is mostly empty space.
The mass and positive charge of the atom are concentrated in a tiny, dense nucleus.
Electrons are distributed evenly throughout a positively charged sphere.
The nucleus contains neutrons as well as protons.
114 exam-style questions on CIE IGCSE Physics 5.1.1a Structure of the atom and ions. Each one has a worked solution and a mark scheme showing where the marks go.