Which describes Ernest Rutherford's experiment?

1. Positive particles are fired at gold foil. Most bounce back, but some pass through.

2. Negative particles are fired at gold foil. Most bounce back, but some pass through.

3. Positive particles are fired at gold foil. Most pass through, but some bounce back.

4. Negative particles are fired at gold foil. Most pass through, but some bounce back.

3. Positive particles are fired at gold foil, most pass through, but some bounced back.

Explanation:

This is referred to as the gold foil experiment so as to explain the structure of an atom. Ernest Rutherford's bombarded a gold foil with an alpha particles, and observed that most of these particles pass through the foil while some bounced back. He remarked that there must be parts of the gold foil which has the same charge as the alpha particles so as to repel them. These parts within the foil are the nucleus of atoms of the gold foil.

3. Positive particles are fired at gold foil. Most pass through, but some bounce back.

Explanation:

The model of the atom was developed through several experiments which included Ernest Rutherford's gold foil experiment. He discovered the nucleus of an atom through this experiment. In the experiment positively charged alpha particles emitted by a radioactive element were fired at the center of the gold foil, some of the particles were deflected back to the source due to the presence of the positive charge concentrated at the center of the atom, which showed the presence of the nucleus. However, the electrons around the nucleus showed no effect on the scattering of the alpha particles as most of them pass through the foil.