The proton and neutron are collectively called as

The fundamental particles present in the nucleus of an atom are

The radius of a nucleus with mass number $A$ is given by $1.25 \times 10^{-13} \times A^{1/3} \ cm$. If the radius of the atom is $1 \ \mathring{A}$ and the mass number is $64$,calculate the fraction of the volume occupied by the nucleus.

The ratio of charge to mass ($e/m$ ratio) is greatest for which of the following particles?

The mass of an atom is constituted mainly by

Rutherford's $\alpha$-particle scattering experiment is related to the size of the ..........