The size of an atom is of the order of

According to the Rutherford's atomic model,the electrons inside the atom are

In Rutherford's experiment,the number of particles scattered at a $90^{\circ}$ angle is $x$ per second. The number of particles scattered per second at an angle of $60^{\circ}$ is:

Using Thomson's model of the atom,consider an atom consisting of two electrons,each of charge $-e$,embedded in a sphere of charge $+2e$ and radius $R$. In equilibrium,each electron is at a distance $d$ from the center of the atom. What is the equilibrium separation between the electrons?

Are atoms divisible or indivisible? Explain.

Describe the Geiger-Marsden scattering experiment.