Question

who invented the nucleus and when

Answer 1

Answer ===Discovery of the nucleus Ernest Rutherford in 1909..

Answer 2

Hi,
Since there are 2 nucleus - one is cell nucleus,the other is atomic nucleus. Both of them were invented by different people.

Discovery of the Cell Nucleus
The term cell nucleus was used by Robert Brown for the first time in 1831 in a paper to the Linnean Society and it was published in 1833. At the time of publishing he did not realize that cell nucleus was present in cells other than those belonging to plants.

During his stay in Australia,Brown studied nearly 1700 plant species and other notable observations include the identification of naked ovule of the gymnospermae.

While he was scrutinizing the epidermis of a collection of orchids with his microscope, Brown found that the cells contained an opaque spot. He used the term areola to describe them. They had been seen by other scientists previously who most likely regarded them as insignificant.

Discovery of the Atomic Nucleus
The presence of a nucleus in an atom was discovered and proved by Nobel Laureate Dr. Ernest Rutherford through his gold leaf scattering experiment.

Another thing you must understand is that nucleus or an atom in general, is not a physical entity; i.e., there is no such thing as a spherical object which can be called a nucleus.

Nucleus is just a scientifically defined system which shows the range in which protons and neutrons co-exist.

Hope this helps you...