Rutherford's $\alpha$-particle experiment showed that the atoms have

The Rutherford $\alpha$-particle experiment shows that most of the $\alpha$-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom?

State and explain Dalton's atomic theory.

An $\alpha$-particle of $5 \; MeV$ energy strikes a stationary uranium nucleus at a scattering angle of $180^o$. The distance of closest approach of the $\alpha$-particle to the nucleus will be of the order of:

Describe the Geiger-Marsden scattering experiment.

State the postulates of Dalton's atomic theory.