Answer:
most of the atom's mass and all of the atom's positive charge
Explanation:
Based on Rutherford's model most of the atom's mass and all of the positive charges are concentrated in the nucleus.
Rutherford performed the gold foil experiment that gave the modelling of the atomic structure a boost.
- His experiment reveals that most of the alpha particles passed through the foil while a few of them were deflected back.
- Rutherford suggested an atomic model in which the atom has a small positively charged center where nearly all the mass is concentrated.
- The charged center is made up of smaller particles called protons.
