Nuclear Dimensions and Rutherford Atomic Model

According to the Rutherford model of the atom, the nucleus is a tiny, positively charged core at the center of the atom. 

The size of the nucleus can be estimated using the results of the gold foil experiment conducted by Ernest Rutherford.

In the experiment, a thin gold foil was bombarded with alpha particles. 

Most of the particles passed through the foil with little deflection, indicating that they were passing through empty space in the atom. 

However, a small fraction of the particles were deflected at large angles or even bounced back, suggesting that they were encountering a concentrated positive charge in a small volume within the atom - the nucleus.

Rutherford concluded that the nucleus must be extremely small compared to the overall size of the atom. He estimated the nuclear size to be about 1/100,000th of the size of the entire atom.

The actual dimensions of the nucleus are specific to each element and can be measured experimentally using techniques such as scattering experiments or electron microscopy.