Experimental evidence for the existence of the atomic nucleus comes from

The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number $A$ is given by $1.25 \times 10^{-13} \times A^{1/3} \ cm$. The radius of the atom is $1 \ \mathring{A}$. If the mass number is $64$,then the fraction of the atomic volume that is occupied by the nucleus is:

What is a kernel in the context of atomic structure?

Explain the discovery of the electron.

Provide general information about the fundamental particles of an atom.

Which of the following sub-atomic particles is not considered a fundamental constituent of a standard atom?