Rutherford's Atomic Model Key Feature

Rutherford's atomic model, established through his gold foil experiment, introduced a new concept for the structure of the atom.

Core Findings of Rutherford's Experiment

The experiment showed that:

• Atoms are mostly empty space, as most alpha particles passed through the gold foil undisturbed.
• A small, dense region within the atom deflected some alpha particles, indicating it held a positive charge and most of the atom's mass.

Evaluating Features of Atomic Models

Comparing the options against Rutherford's findings:

• Option 1 is incorrect because Rutherford identified a positive nucleus, not electrons, at the center.
• Option 2 describes Thomson's model, not Rutherford's.
• Option 3 correctly states that the atom has a dense positive nucleus at the center. This was the central discovery of Rutherford's work.
• Option 4 describes electron shells, a concept refined later by Bohr, not the primary discovery of Rutherford's model.

Identifying Rutherford's Model's Defining Feature

The key takeaway from Rutherford's research was the existence of a compact, positively charged center within the atom, which he termed the nucleus.