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Question

Rutherford's alpha scattering experiment showed that most alpha particles directed toward a thin metallic foil passed through with only slight deviations. From this evidence we can coclude that
1. mass of the atom is concetrated in a small area
2. alpha particle are uncharge
3. foil too thin
4. alpha particle is type of light should not be deflect

Answer 1

1) some particles bounced off of the dense center

Answer 2

The answer is based on the fact that the alpha ray only deflected when it hit the very small center of the atom. Otherwise it passed straight through. Rutherford called this small center the "nucleus"