The correct option is A Positive charge is not evenly distributed throughout an atom
Rutherford bombarded a thin sheet of gold with alpha particles in an evacuated chamber. He made the following observations:
∙ Most of the alpha particles passed straight through the foil without any deflection from the path.
∙ A small fraction of them was deflected from their original path by small angles, only a few particles bounced back.
From these observations, he arrived at the following conclusions:
∙ Positive charge is present at the centre of an atom in a very small space.
∙ Most of the space in an atom is empty.
∙ Entire mass of an atom is concentrated at the centre. Hence, he proved that the positive charge is not distributed in an even manner inside the atom.