When alpha particle is sent through a thin foil, most of them go straight through the foil because?
Most of the space in atom is empty.
Rutherford experiment of scattering of alpha particles to determine the structure of atom,where gold foil was used and alpha particle were made to fall on gold foil and most of the alpha particles passed straight through the gold foil, from which Rutherford gave an conclusion that most space inside the atom is empty because most alpha particle pass straight through the gold foil without any deflection.