Name the scientist who discovered the nucleus of atom

What do you understand by the tern ‘electronic configuration” of an element? Write down the electronic configuration of oxygen (At. No. = 8).

What is the nucleus of an atom and what is the nature of charge on it?

Name the particles used by Rutherford in his experiment on the discovery of nucleus. Also state the charge on these particles.

An element has atomic number 13 and an atomic mass of 27.

(a) How many electrons are there in each atom of the element?

(b) How are these electrons distributed in the various energy levels?