Answer:
See explanation
Step-by-step explanation:
Though the models were not shown pictorially in the question, the model that was described in the question is Rutherford's model of the atom.
The dense matter at the middle of the atom is called the nucleus of the atom. Particles rebounded because of repulsion between the positively charged nucleus and the bombarding alpha particles. The nucleus have a smaller radius than the atom itself hence most particles go through.
Rutherford's model is also known as the nuclear model of the atom.