According to the nuclear model of an atom,where is the whole mass of the atom located?

In the Geiger-Marsden experiment, the number of scattered $\alpha$-particles $N(\theta)$ is plotted as a function of the scattering angle $\theta$. Which of the following options represents the correct plot?

Which source is associated with a line emission spectrum?

What is the plum pudding model of the atom?

Are atoms divisible or indivisible? Explain.

In Rutherford's $\alpha$-particle scattering experiment,which of the following was discovered?