In the Geiger-Marsden α\alphaα-particle scattering experiment, which observation directly led to the conclusion that the majority of an atom's mass and positive charge is concentrated in a tiny nucleus?
Almost all of the α\alphaα-particles passed straight through the metal foil undeflected.
A very small fraction of the α\alphaα-particles were deflected through angles greater than 90∘90^\circ90∘.
The kinetic energy of the deflected α\alphaα-particles increased after passing through the foil.
Electrons were ejected from the metal foil at high speeds.
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.