The neutron possesses:

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:

Cathode rays are

The discovery of ......... was made through Rutherford's scattering experiment.

The part of the atom excluding the outermost shell is known as the ...... .

The heaviest particle among the following is: