Calculate the ratio of the diameter of an atom to the diameter of its nucleus.

Which of the following particles cannot be accelerated by an electric or magnetic field?

Who discovered the proton and the neutron?

The neutron possesses:

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

$A$ certain particle carries $2.5 \times 10^{-16} \, C$ of static electric charge. Calculate the number of electrons present in it.