The number of completely filled shells for the element ${ }_{16} S ^{32}$ is
$1$
$2$
$3$
$4$
In the Rutherford experiment, $\alpha -$ particles are scattered from a nucleus as shown. Out of the four paths, which path is not possible?
As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom/ion
Choose the correct option from the following options given below
What radioactive source did the Geiger and Marsden use in the scattering experiment?
In the following diagram, which particle has highest $e/m$ value?