throughout its volume, but was concentrated in a very tiny volume, at the atom’s
center. Alpha particles that came close to this concentration of positive charge
experienced a strong Coulombic repulsive force and were deflected through large
angles.
The tiny volume in which the positive charge is concentrated in an atom is known
as the nucleus, and the nucleus is surrounded by a swarm of negatively charged
electrons. This model is known as the Rutherford nuclear model.